[libc++] Revert moving the pre-release checklist

I had not seen https://reviews.llvm.org/D150585 which supersedes
this, and I want to avoid merge conflicts for D150585.

Author: ldionne

libcxx/docs/Contributing.rst

@@ -61,6 +61,18 @@ rule -- for very simple patches, use your judgement. The `"libc++" review group
 consists of frequent libc++ contributors with a good understanding of the project's
 guidelines -- if you would like to be added to it, please reach out on Discord.
 
+Post-release check list
+=======================
+
+After branching for an LLVM release:
+
+1. Update ``_LIBCPP_VERSION`` in ``libcxx/include/__config``
+2. Update the version number in ``libcxx/docs/conf.py``
+3. Update ``_LIBCPPABI_VERSION`` in ``libcxxabi/include/cxxabi.h``
+4. Update ``_LIBUNWIND_VERSION`` in ``libunwind/include/__libunwind_config.h``
+5. Update the list of supported clang versions in ``libcxx/docs/index.rst``
+6. Remove the in-progress warning from ``libcxx/docs/ReleaseNotes.rst``
+
 Exporting new symbols from the library
 ======================================
 
@@ -206,16 +218,3 @@ Contains the jobs executed in the CI. This file contains the version
 information of the jobs being executed. Since this script differs between the
 ``main`` and ``release`` branch, both branches can use different compiler
 versions.
-
-Post-release check list
-=======================
-
-Here's a list of tasks to do after branching for an LLVM release. This
-is only meant for the review manager, not for individual contributors.
-
-1. Update ``_LIBCPP_VERSION`` in ``libcxx/include/__config``
-2. Update the version number in ``libcxx/docs/conf.py``
-3. Update ``_LIBCPPABI_VERSION`` in ``libcxxabi/include/cxxabi.h``
-4. Update ``_LIBUNWIND_VERSION`` in ``libunwind/include/__libunwind_config.h``
-5. Update the list of supported clang versions in ``libcxx/docs/index.rst``
-6. Remove the in-progress warning from ``libcxx/docs/ReleaseNotes.rst``