pushed: [RFA/commit+doco] GDB/MI: Document support for -exec-run --start in -list-features

[Joel Brobecker]

> gdb/ChangeLog:
> 
>         * mi/mi-main.c (mi_cmd_list_features): add "exec-run-start-option".
>         * NEWS: Expand the entry documenting the new -exec-run --start
>         option to mention the corresponding new entry in the output of
>         "-list-features".
> 
> gdb/doc/ChangeLog:
> 
> 	* gdb.texinfo (GDB/MI Miscellaneous Commands): Document the new
> 	"exec-run-start-option" entry in the output of the "-list-features"
> 	command.
> 
> gdb/testsuite/ChangeLog:
> 
>         * gdb.mi/mi-start.exp: Add test verifying that -list-features
>         contains "exec-run-start-option".

FYI, I pushed this patch. I will be working on Eli's suggestion for
more indexing next.

-- 
Joel