Fix some typos and add some links (#4257)

Author: warsaw

peps/pep-0739.rst

@@ -102,9 +102,9 @@ below, which is rendered in an human-readable format here.
       - Schema version.
 
         This is a string following the format ``<MAJOR>.<MINOR>``, where
-        ``<MAJOR>`` and ``<MINOR>`` are unpaded numbers and represent
+        ``<MAJOR>`` and ``<MINOR>`` are unpadded numbers and represent
         the **major** and **minor** components of the version. Versions
-        may be arithmetically compared by intrepreting the version
+        may be arithmetically compared by interpreting the version
         string as a decimal number.
 
         For this specification version, this value is constant and
@@ -149,7 +149,7 @@ below, which is rendered in an human-readable format here.
     * - Type
       - ``string``
     * - Description
-      - The path to the Python interprer of the base installation.
+      - The path to the Python interpreter of the base installation.
 
         Either an absolute path, or a path relative to ``base_prefix``.
 
@@ -301,11 +301,11 @@ below, which is rendered in an human-readable format here.
     * - Type
       - ``object``
     * - Description
-      - Object containing details related to Python implementation.
+      - Object containing details related to the Python implementation.
 
         This section **SHOULD** be equivalent to
-        :py:data:`sys.implementation`. It follows specification defined
-        in PEP 421, meaning that on top of the required keys,
+        :py:data:`sys.implementation`. It follows the specification defined
+        in :pep:`421`, meaning that in addition to the required keys,
         implementation-specific keys can also exist, but must be
         prefixed with an underscore.
     * - Required
@@ -466,7 +466,8 @@ below, which is rendered in an human-readable format here.
     * - Type
       - ``string``
     * - Description
-      - Suffix used for extensions built against the stable ABI.
+      - Suffix used for extensions built against the `stable ABI
+        <https://docs.python.org/3/c-api/stable.html#stable-abi>`_.
 
         This field **MUST** be present if the Python implementation has
         a stable ABI extension suffix, otherwise this entry will be