Remove limit on /r/all- and add info to gold page

r2/r2/models/subreddit.py

@@ -1042,9 +1042,7 @@ class AllMinus(AllSR):
         from r2.lib.db.operators import not_
         q = AllSR.get_links(self, sort, time)
         if c.user.gold:
-            excluded_ids = self.random_reddits(c.user.name, self.sr_ids,
-                                               self.gold_limit)
-            q._filter(not_(Link.c.sr_id.in_(excluded_ids)))
+            q._filter(not_(Link.c.sr_id.in_(self.sr_ids)))
         return q
 
 class _DefaultSR(FakeSubreddit):

r2/r2/templates/goldinfopage.html

@@ -58,7 +58,7 @@
     ${feature_item(static('gold/sample-filterall.png'),
       _(
         "# Filter specific subreddits from /r/all.\n"
-        "Are there subreddits you don't want to see? Customize /r/all by removing them."
+        "Are there subreddits you don't want to see? Customize /r/all by removing them with a url like /r/all-operative-badger (up to ~300 removals - limited by maximum url length)."
       ), 'new')}
     ${feature_item(static('gold/sample-morecomments.png'),
       _(