Add comments how to hide the field of study in the example documents

example/mu/example.dtx

@@ -90,6 +90,9 @@
     type               = bc,
     programme          = NA,
     field              = Applied Econometrics,
+    %% To hide the field of study in the Bibliographic 
+    %% record, replace the previous uncommented line with
+    %% field           = {},
     department         = Department of Finance,
     author             = Jane Doe,
     gender             = f,
@@ -122,6 +125,9 @@
     %% English thesis.
     programmeEn        = NA,
     fieldEn            = Applied Econometrics,
+    %% To hide the field of study in the Bibliographic 
+    %% record, replace the previous uncommented line with
+    %% fieldEn         = {},
     departmentEn       = Department of Finance,
     titleEn            = The Economic Value of LaTeX,
     TeXtitleEn         = The Economic Value of \LaTeX,
@@ -180,6 +186,10 @@
     type          = bc,
     programme     = NA,
     field         = Sport Management,
+    %% To hide the field of study in the Bibliographic 
+    %% record and the Title Page, replace the previous 
+    %% uncommented line with
+    %% field      = {},
     department    = Department of Social Sciences and Sport Management,
     author        = Jane Doe,
     gender        = f,
@@ -201,6 +211,9 @@
     %% English thesis.
     programmeEn   = NA,
     fieldEn       = Applied Econometrics,
+    %% To hide the field of study in the Bibliographic 
+    %% record, replace the previous uncommented line with
+    %% fieldEn    = {},
     departmentEn  = Department of Finance,
     titleEn       = The Economic Value of LaTeX,
     TeXtitleEn    = The Economic Value of \LaTeX,
@@ -221,6 +234,9 @@
     type          = bc,
     programme     = NA,
     field         = Psychology,
+    %% To hide the field of study in the Bibliographic 
+    %% record, replace the previous uncommented line with
+    %% field      = {},
     department    = Department of Health,
     author        = Jane Doe,
     gender        = f,
@@ -247,6 +263,9 @@
     %% English thesis.
     programmeEn   = NA,
     fieldEn       = Psychology,
+    %% To hide the field of study in the Bibliographic 
+    %% record, replace the previous uncommented line with
+    %% field      = {},
     departmentEn  = Department of Health,
     titleEn       = LaTeX and Its Impact on the
                     Information Society,
@@ -268,6 +287,9 @@
     faculty       = law,
     type          = bc,
     field         = Law and Finance,
+    %% To hide the field of study from the Title Page, 
+    %% replace the previous uncommented line with
+    %% field      = {},
     department    = The Department of Commercial Law,
     author        = Jane Doe,
     gender        = f,
@@ -353,6 +375,10 @@
     type          = bc,
     programme     = NA,
     field         = Speech Therapy,
+    %% To hide the field of study in the Bibliographic 
+    %% record and the Title Page, replace the previous 
+    %% uncommented line with
+    %% field           = {},
     department    = Department of Primary Pedagogy,
     author        = Jane Doe,
     gender        = f,
@@ -379,6 +405,9 @@
     %% English thesis.
     programmeEn   = NA,
     fieldEn       = Speech Therapy,
+    %% To hide the field of study in the Bibliographic 
+    %% record, replace the previous uncommented line with
+    %% fieldEn      = {},
     departmentEn  = Department of Primary Pedagogy,
     titleEn       = The Challenges of Teaching LaTeX
                     to Preschool Children,
@@ -401,6 +430,10 @@
     type               = bc,
     programme          = NA,
     field              = Pharmacy,
+    %% To hide the field of study in the Bibliographic 
+    %% record and the Title Page, replace the previous 
+    %% uncommented line with
+    %% field           = {},
     department         = Department of Pharmacy,
     author             = Jane Doe,
     gender             = f,
@@ -429,6 +462,9 @@
     %% English thesis.
     programmeEn        = NA,
     fieldEn            = Pharmacy,
+    %% To hide the field of study in the Bibliographic 
+    %% record, replace the previous uncommented line with
+    %% field           = {},
     departmentEn       = Department of Pharmacy,
     titleEn            = Plotting Data in LaTeX,
     TeXtitleEn         = Plotting Data in \LaTeX,
@@ -449,6 +485,9 @@
     type        = bc,
     programme   = NA,
     field       = Cognitive Sciences,
+    %% To hide the field of study from the Title Page, 
+    %% replace the previous uncommented line with
+    %% field           = {},
     department  = Department of Psychology,
     author      = Jane Doe,
     gender      = f,
@@ -470,6 +509,9 @@
     %% English thesis.
     programmeEn	       = NA,
     fieldEn            = Cognitive Sciences,
+    %% To hide the field of study, replace 
+    %% the previous uncommented line with
+    %% fieldEn         = {},
     departmentEn       = Department of Psychology,
     titleEn            = What Can Typography Tell Us
 	                 About the Nature of Man,
@@ -493,6 +535,9 @@
                       Statistics,
     programme       = Mathematics,
     field           = Financial and Insurance Mathematics,
+    %% To hide the field of study in the Bibliographic 
+    %% record, replace the previous uncommented line with
+    %% field        = {},
     type            = bc,
     author          = Jane Doe,
     gender          = f,
@@ -519,6 +564,9 @@
     %% English thesis.
     programmeEn     = Mathematics,
     fieldEn         = Financial and Insurance Mathematics,
+    %% To hide the field of study in the Bibliographic 
+    %% record, replace the previous uncommented line with
+    %% field        = {},
     departmentEn    = Department of Mathematics and
 	              Statistics,
     titleEn         = The Principles of the Typesetting of