Clarify that we do not remove functionality in minor versions of OpenCL (KhronosGroup#1265)

Change-Id: Iee7de47816ae8f40f684d713ad53bd886f4fcbd5

Signed-off-by: Kevin Petit <kevin.petit@arm.com>

Author: kpet

api/introduction.asciidoc

@@ -98,8 +98,8 @@ _major.minor_ components of the version number.
 A difference in the _major_ or _minor_ version number indicates that some
 amount of new functionality has been added to the specification, and may also
 include behavior changes and bug fixes.
-Functionality may also be deprecated or removed when the _major_ or _minor_
-version changes.
+Functionality may also be deprecated when the _major_ or _minor_ version
+changes or removed when the _major_ version changes.
 
 A difference in the _revision_ number indicates small changes to the
 specification, typically to fix a bug or to clarify language.