Update CommandLine.rst getRegisteredOptions example

[kastiglione]

Summary

Update the docs to match the changes in http://reviews.llvm.org/D7132

[modocache]

Looks good to me, thanks for updating the documentation!

[kastiglione]

Thanks. @modocache would you mind committing this?

[modocache]

Gah, sorry @kastiglione, I thought Arcanist would attach a "Path by Dave Lee" as attribution at the bottom of the commit, but it didn't. My bad! :(

Does anyone know how to append an attribution to a commit message when landing diffs via Arcanist?

[malcolm.parsons]

In D26296#587814, @modocache wrote:

Does anyone know how to append an attribution to a commit message when landing diffs via Arcanist?

One of:
Edit the message in phabricator before landing.
If using git-svn, use git commit --amend.
If using svn, use arc commit --show, copy, paste and edit.

docs/CommandLine.rst

 Here is an example of how the function could be used:
 
 .. code-block:: c++
 
   using namespace llvm;
   int main(int argc, char **argv) {
     cl::OptionCategory AnotherCategory("Some options");
 
-    StringMap<cl::Option*> Map;
-    cl::getRegisteredOptions(Map);
+    StringMap<cl::Option*> &Map = cl::getRegisteredOptions();
 
     //Unhide useful option and put it in a different category
     assert(Map.count("print-all-options") > 0);
     Map["print-all-options"]->setHiddenFlag(cl::NotHidden);
     Map["print-all-options"]->setCategory(AnotherCategory);
 
     //Hide an option we don't want to see
     assert(Map.count("enable-no-infs-fp-math") > 0);