Refer to -help instead of --help since this is what tools themselves say.
Also, have tools output -help-hidden rather than refer to --help-hidden,
for consistency, and likewise adjust documentation.  This doesn't change
every mention of --help, only those which seemed clearly safe.

llvm-svn: 96578
diff --git a/llvm/docs/CommandGuide/llvm-nm.pod b/llvm/docs/CommandGuide/llvm-nm.pod
index 995ac08..a580d3f 100644
--- a/llvm/docs/CommandGuide/llvm-nm.pod
+++ b/llvm/docs/CommandGuide/llvm-nm.pod
@@ -77,7 +77,7 @@
 
 Use BSD output format. Alias for B<--format=bsd>.
 
-=item B<--help>
+=item B<-help>
 
 Print a summary of command-line options and their meanings.