[RFA 03/12] Update core-related help strings

[Tom Tromey <tom@tromey.com>]

This updates some help strings in corefile.c and gcore.c.

2018-04-27  Tom Tromey  <tom@tromey.com>

	* corefile.c (_initialize_core): Update help string.
	* gcore.c (_initialize_gcore): Update help string.
---
 gdb/ChangeLog  | 5 +++++
 gdb/corefile.c | 1 +
 gdb/gcore.c    | 3 ++-
 3 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/gdb/corefile.c b/gdb/corefile.c
index 5a735264ef..d8f30cf804 100644
--- a/gdb/corefile.c
+++ b/gdb/corefile.c
@@ -509,6 +509,7 @@ _initialize_core (void)
 
   c = add_cmd ("core-file", class_files, core_file_command, _("\
 Use FILE as core dump for examining memory and registers.\n\
+Usage: core-file FILE\n\
 No arg means have no core file.  This command has been superseded by the\n\
 `target core' and `detach' commands."), &cmdlist);
   set_cmd_completer (c, filename_completer);
diff --git a/gdb/gcore.c b/gdb/gcore.c
index 5ff4e6dc77..c53810049c 100644
--- a/gdb/gcore.c
+++ b/gdb/gcore.c
@@ -611,7 +611,8 @@ _initialize_gcore (void)
 {
   add_com ("generate-core-file", class_files, gcore_command, _("\
 Save a core file with the current state of the debugged process.\n\
-Argument is optional filename.  Default filename is 'core.<process_id>'."));
+Usage: generate-core-file [FILENAME]\n\
+Argument is optional filename.  Default filename is 'core.PROCESS_ID'."));
 
   add_com_alias ("gcore", "generate-core-file", class_files, 1);
 }
-- 
2.13.6