doc: fix typos in ABI policy

Some errors in the document:

  * API instead of ABI once.

Some typos:

  * __rte_depreciated instead of __rte_deprecated.
  * missing ```` around value.
  * inconsistent reference to major ABI version, most
    of the time described without the minor appended, except once.

Verbosity and grammar:

  * Long sentences that would be better cut short.
  * Comma abuse.
  * 'May' used where 'can' seems more fitting.

I'm not a native speaker though, so grain of salt applies.

Fixes: fdf7471 ("doc: introduce major ABI versions")
Cc: stable@dpdk.org

Signed-off-by: Gaetan Rivet <grive@u256.net>
Acked-by: Ray Kinsella <mdr@ashroe.eu>

doc/guides/contributing/abi_policy.rst

@@ -226,19 +226,18 @@ Examples of ABI Changes
 The following are examples of allowable ABI changes occurring between
 declarations of major ABI versions.
 
-* DPDK 19.11 release, defines the function ``rte_foo()``, and ``rte_foo()``
-  as part of the major ABI version ``20``.
+* DPDK 19.11 release defines the function ``rte_foo()`` ; ``rte_foo()``
+  is part of the major ABI version ``20``.
 
-* DPDK 20.02 release defines a new function ``rte_foo(uint8_t bar)``, and
-  this is not a problem as long as the symbol ``rte_foo@DPDK20`` is
+* DPDK 20.02 release defines a new function ``rte_foo(uint8_t bar)``.
+  This is not a problem as long as the symbol ``rte_foo@DPDK20`` is
   preserved through :ref:`abi_versioning`.
 
   - The new function may be marked with the ``__rte_experimental`` tag for a
     number of releases, as described in the section :ref:`experimental_apis`.
 
-  - Once ``rte_foo(uint8_t bar)`` becomes non-experimental ``rte_foo()`` is then
-    declared as ``__rte_depreciated``, with an associated deprecation notice
-    provided.
+  - Once ``rte_foo(uint8_t bar)`` becomes non-experimental, ``rte_foo()`` is
+    declared as ``__rte_deprecated`` and an deprecation notice is provided.
 
 * DPDK 19.11 is not re-released to include ``rte_foo(uint8_t bar)``, the new
   version of ``rte_foo`` only exists from DPDK 20.02 onwards as described in the
@@ -248,13 +247,13 @@ declarations of major ABI versions.
   rte_baz()``. This function may or may not exist in the DPDK 20.05 release.
 
 * An application ``dPacket`` wishes to use ``rte_foo(uint8_t bar)``, before the
-  declaration of the DPDK ``21`` major API version. The application can only
+  declaration of the DPDK ``21`` major ABI version. The application can only
   ensure its runtime dependencies are met by specifying ``DPDK (>= 20.2)`` as
-  an explicit package dependency, as the soname only may only indicate the
+  an explicit package dependency, as the soname can only indicate the
   supported major ABI version.
 
 * At the release of DPDK 20.11, the function ``rte_foo(uint8_t bar)`` becomes
-  formally part of then new major ABI version DPDK 21.0 and ``rte_foo()`` may be
+  formally part of then new major ABI version DPDK ``21`` and ``rte_foo()`` may be
   removed.
 
 .. _deprecation_notices:
@@ -333,6 +332,6 @@ Libraries
 
 Libraries marked as ``experimental`` are entirely not considered part of an ABI
 version, and may change without warning at any time. Experimental libraries
-always have a major version of ``0`` to indicate they exist outside of
+always have a major ABI version of ``0`` to indicate they exist outside of
 :ref:`abi_versioning` , with the minor version incremented with each ABI change
 to library.