mdocml: Deprecate .Tn and .Ux, and make it clearer that .Bt and .Ud are

[schwarze@mdocml.bsd.lv]

Log Message:
-----------
Deprecate .Tn and .Ux, and make it clearer that .Bt and .Ud are deprecated.
Do not use these macros in new documents, they provide no value.
Instead, usually no macro and no markup is needed at all.
Of course, they remain supported for compatibility with existing manuals.

Jason McIntyre (OpenBSD), Thomas Klausner (NetBSD) and 
Franco Fichtner (DragonFly) are OK with this documentation change.

Modified Files:
--------------
    mdocml:
        mdoc.7

Revision Data
-------------
Index: mdoc.7
===================================================================
RCS file: /usr/vhosts/mdocml.bsd.lv/cvs/mdocml/mdoc.7,v
retrieving revision 1.229
retrieving revision 1.230
diff -Lmdoc.7 -Lmdoc.7 -u -p -r1.229 -r1.230
--- mdoc.7
+++ mdoc.7
@@ -513,7 +513,6 @@ in the alphabetical
 .It Sx \&Cd Ta kernel configuration declaration (>0 arguments)
 .It Sx \&Ad Ta memory address (>0 arguments)
 .It Sx \&Ms Ta mathematical symbol (>0 arguments)
-.It Sx \&Tn Ta tradename (>0 arguments)
 .El
 .Ss Physical markup
 .Bl -column "Brq, Bro, Brc" description
@@ -541,7 +540,6 @@ in the alphabetical
 .It Sx \&Ex Fl std Ta standard command exit values: Op Ar utility ...
 .It Sx \&Rv Fl std Ta standard function return values: Op Ar function ...
 .It Sx \&St Ta reference to a standards document (one argument)
-.It Sx \&Ux Ta Ux
 .It Sx \&At Ta At
 .It Sx \&Bx Ta Bx
 .It Sx \&Bsx Ta Bsx
@@ -752,9 +750,8 @@ See also
 .Sx \&Dx ,
 .Sx \&Fx ,
 .Sx \&Nx ,
-.Sx \&Ox ,
 and
-.Sx \&Ux .
+.Sx \&Ox .
 .Ss \&Bc
 Close a
 .Sx \&Bo
@@ -1118,10 +1115,10 @@ See also
 .Sx \&Dx ,
 .Sx \&Fx ,
 .Sx \&Nx ,
-.Sx \&Ox ,
 and
-.Sx \&Ux .
+.Sx \&Ox .
 .Ss \&Bt
+Supported only for compatibility, do not use this in new manuals.
 Prints
 .Dq is currently in beta test.
 .Ss \&Bx
@@ -1141,9 +1138,8 @@ See also
 .Sx \&Dx ,
 .Sx \&Fx ,
 .Sx \&Nx ,
-.Sx \&Ox ,
 and
-.Sx \&Ux .
+.Sx \&Ox .
 .Ss \&Cd
 Kernel configuration declaration.
 This denotes strings accepted by
@@ -1441,9 +1437,8 @@ See also
 .Sx \&Bx ,
 .Sx \&Fx ,
 .Sx \&Nx ,
-.Sx \&Ox ,
 and
-.Sx \&Ux .
+.Sx \&Ox .
 .Ss \&Ec
 Close a scope started by
 .Sx \&Eo .
@@ -1492,7 +1487,7 @@ See also
 and
 .Sx \&Sy .
 .Ss \&En
-This macro is obsolete and not implemented in
+This macro is obsolete and ignored by
 .Xr mandoc 1 .
 .Ss \&Eo
 An arbitrary enclosure.
@@ -1519,7 +1514,8 @@ See also
 .Sx \&Dv
 for general constants.
 .Ss \&Es
-This macro is obsolete and not implemented.
+This macro is obsolete and ignored by
+.Xr mandoc 1 .
 .Ss \&Ev
 Environmental variables such as those specified in
 .Xr environ 7 .
@@ -1699,7 +1695,7 @@ See also
 and
 .Sx \&Ft .
 .Ss \&Fr
-This macro is obsolete and not implemented in
+This macro is obsolete and ignored by
 .Xr mandoc 1 .
 .Pp
 It was used to show function return values.
@@ -1744,9 +1740,8 @@ See also
 .Sx \&Bx ,
 .Sx \&Dx ,
 .Sx \&Nx ,
-.Sx \&Ox ,
 and
-.Sx \&Ux .
+.Sx \&Ox .
 .Ss \&Hf
 This macro is not implemented in
 .Xr mandoc 1 .
@@ -2064,9 +2059,8 @@ See also
 .Sx \&Bx ,
 .Sx \&Dx ,
 .Sx \&Fx ,
-.Sx \&Ox ,
 and
-.Sx \&Ux .
+.Sx \&Ox .
 .Ss \&Oc
 Close multi-line
 .Sx \&Oo
@@ -2120,7 +2114,7 @@ See also
 and
 .Sx \&Dt .
 .Ss \&Ot
-This macro is obsolete and not implemented in
+This macro is obsolete and ignored by
 .Xr mandoc 1 .
 .Pp
 Historical
@@ -2143,9 +2137,8 @@ See also
 .Sx \&Bx ,
 .Sx \&Dx ,
 .Sx \&Fx ,
-.Sx \&Nx ,
 and
-.Sx \&Ux .
+.Sx \&Nx .
 .Ss \&Pa
 An absolute or relative file system path, or a file or directory name.
 If an argument is not provided, the character
@@ -2633,36 +2626,19 @@ Table cell separator in
 lists; can only be used below
 .Sx \&It .
 .Ss \&Tn
-Format a tradename.
-.Pp
-Since this macro is often implemented to use a small caps font,
-it has historically been used for acronyms (like ASCII) as well.
-Such usage is not recommended because it would use the same macro
-sometimes for semantical annotation, sometimes for physical formatting.
-.Pp
-Examples:
-.Dl \&.Tn IBM
+Supported only for compatibility, do not use this in new manuals.
+Even though the macro name
+.Pq Dq tradename
+suggests a semantic function, historic usage is inconsistent, mostly
+using it as a presentation-level macro to request a small caps font.
 .Ss \&Ud
+Supported only for compatibility, do not use this in new manuals.
 Prints out
 .Dq currently under development.
 .Ss \&Ux
-Format the
-.Ux
-name.
-Accepts no argument.
-.Pp
-Examples:
-.Dl \&.Ux
-.Pp
-See also
-.Sx \&At ,
-.Sx \&Bsx ,
-.Sx \&Bx ,
-.Sx \&Dx ,
-.Sx \&Fx ,
-.Sx \&Nx ,
-and
-.Sx \&Ox .
+Supported only for compatibility, do not use this in new manuals.
+Prints out
+.Dq Ux .
 .Ss \&Va
 A variable name.
 .Pp
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