Merging r310700:

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r310700 | yamaguchi | 2017-08-11 02:44:42 -0700 (Fri, 11 Aug 2017) | 11 lines

[Bash-autocompletion] Add --autocomplete flag to 5.0 release notes

Summary:
I thought we should add this information to release notes, because we
added a new flag to clang driver.

Reviewers: v.g.vassilev, teemperor, ruiu

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D36567
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llvm-svn: 310723

clang/docs/ReleaseNotes.rst

@@ -61,7 +61,7 @@ Improvements to Clang's diagnostics
 New Compiler Flags
 ------------------
 
-The option ....
+- --autocomplete was implemented to obtain a list of flags and its arguments. This is used for shell autocompletion.
 
 Deprecated Compiler Flags
 -------------------------