Remove 9.5 references from comments in schedule files.

Replace with version-less reference, no point in repeating this for
every release.

src/test/regress/multi_mx_schedule

@@ -7,7 +7,7 @@
 #
 # Note that we use variant comparison files to test version dependent regression
 # test results. For more information:
-# http://www.postgresql.org/docs/9.5/static/regress-variant.html
+# http://www.postgresql.org/docs/current/static/regress-variant.html
 # ----------
 
 # ---

src/test/regress/multi_schedule

@@ -9,7 +9,7 @@
 #
 # Note that we use variant comparison files to test version dependent regression
 # test results. For more information:
-# http://www.postgresql.org/docs/9.5/static/regress-variant.html
+# http://www.postgresql.org/docs/current/static/regress-variant.html
 # ----------
 
 # ---

src/test/regress/multi_task_tracker_extra_schedule

@@ -7,7 +7,7 @@
 #
 # Note that we use variant comparison files to test version dependent regression
 # test results. For more information:
-# http://www.postgresql.org/docs/9.5/static/regress-variant.html
+# http://www.postgresql.org/docs/current/static/regress-variant.html
 # ----------
 
 # ---