doc/issue_tracker: remove patches as we dont use trac to handle patches

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

doc/issue_tracker.txt

@@ -41,10 +41,6 @@ feature request / enhancement
 license violation
     ticket to keep track of (L)GPL violations of ffmpeg by others
 
-patch
-    A patch as generated by diff which conforms to the patch submission and
-    development policy.
-
 
 Priority:
 ---------
@@ -148,21 +144,6 @@ bug/closed/works_for_me
     reproduction failed - that is the code seems to work correctly to the
     best of our knowledge.
 
-patch/open/approved
-    Patches which have been reviewed and approved by a developer.
-    Such patches can be applied anytime by any other developer after some
-    reasonable testing (compile + regression tests + does the patch do
-    what the author claimed).
-
-patch/open/needs_changes
-    Patches which have been reviewed and need changes to be accepted.
-
-patch/closed/applied
-    Patches which have been applied.
-
-patch/closed/rejected
-    Patches which have been rejected.
-
 feature_request/closed/implemented
     Feature requests which have been implemented.