[groff] 20/27: [doc,man]: Clarify escape sequence "transparency".

[G. Branden Robinson]

gbranden pushed a commit to branch master
in repository groff.

commit 30556824b788e29e3e98ab0755ae599d26669e12
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
AuthorDate: Wed Jan 1 22:56:55 2025 -0600

    [doc,man]: Clarify escape sequence "transparency".
---
 doc/groff.texi.in    | 25 +++++++++++++++++++++----
 man/groff_diff.7.man | 12 ++++++++++--
 2 files changed, 31 insertions(+), 6 deletions(-)

diff --git a/doc/groff.texi.in b/doc/groff.texi.in
index 7f9a1064e..dc9135b8b 100644
--- a/doc/groff.texi.in
+++ b/doc/groff.texi.in
@@ -17959,10 +17959,27 @@ it does not.
 @cindex @code{\H}, incompatibilities with @acronym{AT&T} @code{troff}
 @cindex @code{\s}, incompatibilities with @acronym{AT&T} @code{troff}
 @cindex @code{\S}, incompatibilities with @acronym{AT&T} @code{troff}
-Further, the escape sequences @code{\f}, @code{\H}, @code{\m},
-@code{\M}, @code{\R}, @code{\s}, and @code{\S} are transparent at the
-beginning of a line only in compatibility mode.  For example, this code
-produces bold output in both cases, but the text differs.
+The escape sequences
+@code{\f},
+@code{\H},
+@code{\m},
+@code{\M},
+@code{\R},
+@code{\s},
+and
+@code{\S}
+are transparent at the beginning of a line only in compatibility mode.
+That is,
+upon interpreting them,
+GNU
+.@command{troff} @c GNU
+no longer recognizes a control character on the input line;
+AT&T
+.@command{troff} @c AT&T
+does.
+
+For example, this code produces bold output in both cases, but the text
+differs.
 
 @Example
 .de xx
diff --git a/man/groff_diff.7.man b/man/groff_diff.7.man
index 467fcf07f..db60ca004 100644
--- a/man/groff_diff.7.man
+++ b/man/groff_diff.7.man
@@ -5947,8 +5947,7 @@ See section \[lq]Miscellaneous\[rq] above.
 .
 .
 .P
-Further,
-the escape sequences
+The escape sequences
 .BR \[rs]f ,
 .BR \[rs]H ,
 .BR \[rs]m ,
@@ -5960,6 +5959,15 @@ and
 are transparent at the beginning of an input line only in compatibility
 mode.
 .
+That is,
+upon interpreting them,
+GNU
+.I troff \" GNU
+no longer recognizes a control character on the input line;
+AT&T
+.I troff \" AT&T
+does.
+.
 .
 .P
 GNU