Improved workaround for Centos 8 failure (follow-on to PR #3030). (#3193)

* Rollback of PR #3030 (Working around Centos 8 failure).

* Adding `-DCMAKE_BUILD_TYPE=Release`

* Improving existing workaround (undoing the originally intended rollback).

* Fixing minor documentation bug.

.github/workflows/ci.yml

@@ -594,13 +594,13 @@ jobs:
 
     - name: VAR_BUILD_TYPE 7
       if: matrix.centos == 7
-      run: echo Release > VAR_BUILD_TYPE
+      run: echo MinSizeRel > VAR_BUILD_TYPE
 
-    # Using Debug to avoid segfault that appeared around 2021-06-04,
+    # Using Release to avoid segfault that appeared around 2021-06-04,
     # apparently when the gcc version changed from 8.3 to 8.4.
     - name: VAR_BUILD_TYPE 8
       if: matrix.centos == 8
-      run: echo Debug > VAR_BUILD_TYPE
+      run: echo Release > VAR_BUILD_TYPE
 
     - name: Configure
       shell: bash

tools/pybind11Config.cmake.in

@@ -147,7 +147,7 @@ Add a module and setup all helpers. You can select the type of the library; the
 default is ``MODULE``. There are several options:
 
 ``OPT_SIZE``
-  Optimize for size, even if the ``CMAKE_BUILD_TYPE`` is not ``RelSize``.
+  Optimize for size, even if the ``CMAKE_BUILD_TYPE`` is not ``MinSizeRel``.
 ``THIN_LTO``
   Use thin TLO instead of regular if there's a choice (pybind11's selection
   is disabled if ``CMAKE_INTERPROCEDURAL_OPTIMIZATIONS`` is set).