[m-dev.] for review: improve debugger documentation

[Erwan Jahier]

| Estimated hours taken: 2.5
| 
| doc/user_guide.texi:
| 	Add a "Quick overview" section to the debugger chapter.
| 	Document mdb's Emacs interface.
| 
| doc/mdb_categories:
| 	Fix a bug: it didn't mention the "context" command.
| 
...
| +Then start up Emacs, e.g. using the command @samp{emacs},
| +and type @kbd{M-x mdb @key{RET}}. Emacs will prompt you for
| +the mdb command to invoke; you should type in the name
| +of the program that you want to debug and any arguments
| +that you want to pass to it:
| +

What is said below seems inconsistent with what is said above: Does the user need to 
type "mdb ./hello" (as said below), or just "./hello" (as said above) ?

| + at example
| +Run mdb (like this): mdb ./hello
| + at end example

Apart from that, it looks fine to me.

-- 
R1.


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