Fix broken link on Clang documentation page

[tupaschoal]

Summary

While browsing the latest clang manual, I came across this warning and clicked, but it leads to a broken page, apparently because it's missing the trailing /. Seems to be the only place where it's missing in the whole of LLVM monorepo.

[tupaschoal]

Btw seems to have been broken recently by https://github.com/llvm/llvm-project/commit/f5aa8d191a5b5ea118281bfa410bdb2ee961c704, so tagging @royjacobson too

[brenoguim]

LGTM

[royjacobson]

Thanks! Do you need me to land this for you? If so, could you please provide name + email to sign the commit with?

[tupaschoal]

In D145047#4164976, @royjacobson wrote:

Thanks! Do you need me to land this for you? If so, could you please provide name + email to sign the commit with?

Yes, please!
Tulio Leao <[e-mail]>

clang/docs/ReleaseNotes.rst

 ===========================================
 Clang |release| |ReleaseNotesTitle|
 ===========================================
 
 .. contents::
    :local:
    :depth: 2
 
 Written by the `LLVM Team <https://llvm.org/>`_
 
 .. only:: PreRelease
 
   .. warning::
      These are in-progress notes for the upcoming Clang |version| release.
      Release notes for previous releases can be found on
-     `the Releases Page <https://llvm.org/releases>`_.
+     `the Releases Page <https://llvm.org/releases/>`_.
 
 Introduction
 ============
 
 This document contains the release notes for the Clang C/C++/Objective-C
 frontend, part of the LLVM Compiler Infrastructure, release |release|. Here we
 describe the status of Clang in some detail, including major
 improvements from the previous release and new feature work. For the