Fix a couple documentation typos. (GH-10498)



reproduciblity -> reproducibility
PyPA are the group -> PyPA is the group
diff --git a/Doc/installing/index.rst b/Doc/installing/index.rst
index 8f105a1..747b9223 100644
--- a/Doc/installing/index.rst
+++ b/Doc/installing/index.rst
@@ -48,7 +48,7 @@
   repository of open source licensed packages made available for use by
   other Python users.
 * the `Python Packaging Authority
-  <https://www.pypa.io/>`__ are the group of
+  <https://www.pypa.io/>`__ is the group of
   developers and documentation authors responsible for the maintenance and
   evolution of the standard packaging tools and the associated metadata and
   file format standards. They maintain a variety of tools, documentation,
diff --git a/Doc/whatsnew/3.7.rst b/Doc/whatsnew/3.7.rst
index 55cf74f..8b9b64f 100644
--- a/Doc/whatsnew/3.7.rst
+++ b/Doc/whatsnew/3.7.rst
@@ -432,7 +432,7 @@
 generated. While effective, this invalidation method has its drawbacks.  When
 filesystem timestamps are too coarse, Python can miss source updates, leading to
 user confusion. Additionally, having a timestamp in the cache file is
-problematic for `build reproduciblity <https://reproducible-builds.org/>`_ and
+problematic for `build reproducibility <https://reproducible-builds.org/>`_ and
 content-based build systems.
 
 :pep:`552` extends the pyc format to allow the hash of the source file to be