Add a CommandGuide for llvm-objdump

Summary:
Add a CommandGuide for llvm-objdump summarizing its usage along with some
general context.

Reviewers: beanz

Reviewed By: beanz

Subscribers: Eugene.Zelenko, llvm-commits

Differential Revision: https://reviews.llvm.org/D50034

llvm-svn: 339250
diff --git a/llvm/docs/conf.py b/llvm/docs/conf.py
index 8ead258..91c8656 100644
--- a/llvm/docs/conf.py
+++ b/llvm/docs/conf.py
@@ -257,3 +257,6 @@
 # Pygment lexer are sometimes out of date (when parsing LLVM for example) or
 # wrong. Suppress the warning so the build doesn't abort.
 suppress_warnings = [ 'misc.highlighting_failure' ]
+
+# Direct html-ified man pages to llvm.org
+manpages_url = 'https://llvm.org/docs/CommandGuide/{page}.html'