minor #11872 Remove extra time for security fixes on standard versions (fabpot)

This PR was submitted for the 3.4 branch but it was merged into the 4.4 branch instead (closes #11872).

Discussion
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Remove extra time for security fixes on standard versions

Fixing security issues on standard versions is complicated as the branches diverged a lot. In any case, if someone wants to stick to standard versions (which I would highly recommend), there is already time to do so. So, the extra time for security issues does serve any purpose IMHO.

Commits
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52fa1ce Remove extra time for security fixes on standard versions

Author: javiereguiluz

contributing/community/releases.rst

@@ -59,7 +59,7 @@ ones are considered **standard versions**:
 =======================  =====================  ================================
 Version Type             Bugs are fixed for...  Security issues are fixed for...
 =======================  =====================  ================================
-Standard                 8 months               14 months
+Standard                 8 months               8 months
 Long-Term Support (LTS)  3 years                4 years
 =======================  =====================  ================================