docs/about/deprecated: Remove paragraph about initial deprecation in 2.10

When we introduced the deprecation rule of keeping deprecated features
for two more releases, we had to state that we would not remove features
by surprise that had already been marked as deprecated before. Nowadays,
this paragraph is not needed anymore, so we can remove it now.

Reviewed-by: Daniel P. Berrangé <[email protected]>
Message-ID: <[email protected]>
Signed-off-by: Thomas Huth <[email protected]>

Author: huth

docs/about/deprecated.rst

@@ -24,12 +24,6 @@ should exclusively use a non-deprecated machine type, with use of the most
 recent version highly recommended. Non-versioned machine types follow the
 general feature deprecation policy.
 
-Prior to the 2.10.0 release there was no official policy on how
-long features would be deprecated prior to their removal, nor
-any documented list of which features were deprecated. Thus
-any features deprecated prior to 2.10.0 will be treated as if
-they were first deprecated in the 2.10.0 release.
-
 What follows is a list of all features currently marked as
 deprecated.