[PATCH] gdb docs: do not format the ++ in C++ in man page

["Carl Bordum Hansen" <carl@bordum.dk>]

This change means that the html version of the man page does not stylize
the "++" in the third paragraph.
(https://sourceware.org/gdb/current/onlinedocs/gdb/gdb-man.html). The
tradeoff is, in my opinion, worth it as the man page reads better, since
it is now formatted properly. Before this change, it read as:
"... programs written in C, C@t{++}, ...".
---

Hello, this is my first patch to a GNU project ever and also the first time I
use an email-based git workflow, so please excuse my mistakes :-)

 gdb/doc/gdb.texinfo | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo
index eee0c9d4dd..68c45d9dc9 100644
--- a/gdb/doc/gdb.texinfo
+++ b/gdb/doc/gdb.texinfo
@@ -45056,7 +45056,7 @@ Change things in your program, so you can experiment with correcting the
 effects of one bug and go on to learn about another.
 @end itemize
 
-You can use @value{GDBN} to debug programs written in C, C@t{++}, Fortran and
+You can use @value{GDBN} to debug programs written in C, C++, Fortran and
 Modula-2.
 
 @value{GDBN} is invoked with the shell command @code{gdb}.  Once started, it reads
-- 
2.17.1