[RFA] Update "func" help text to GNU standards

[Tom Tromey]

In my earlier series to change help text to follow the GNU standards
for metasyntactic variables, I missed one: the "func" command.  This
patch updates its help text.

Tested by the buildbot.

gdb/ChangeLog
2018-06-05  Tom Tromey  <tom@tromey.com>

	* stack.c (_initialize_stack): Update "func" help text.
---
 gdb/ChangeLog | 4 ++++
 gdb/stack.c   | 4 ++--
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/gdb/stack.c b/gdb/stack.c
index 97ebc8bc23f..caa71c1bd4e 100644
--- a/gdb/stack.c
+++ b/gdb/stack.c
@@ -2556,8 +2556,8 @@ on this backtrace."));
 
   if (dbx_commands)
     add_com ("func", class_stack, func_command, _("\
-Select the stack frame that contains <func>.\n\
-Usage: func <name>"));
+Select the stack frame that contains NAME.\n\
+Usage: func NAME"));
 
   add_setshow_enum_cmd ("frame-arguments", class_stack,
 			print_frame_arguments_choices, &print_frame_arguments,
-- 
2.13.6