Fix broken links in collection rules

Author: Chad Shaffer

README.md

@@ -2975,7 +2975,7 @@ condition](#safe-assignment-in-condition).
   Do not modify a collection while traversing it.
 <sup>[[link](#no-modifying-collections)]</sup>
 
-* <a name="acessing-elements-directly"></a>
+* <a name="accessing-elements-directly"></a>
   When accessing elements of a collection, avoid direct access
   via `[n]` by using an alternate form of the reader method if it is
   supplied. This guards you from calling `[]` on `nil`.
@@ -2993,7 +2993,7 @@ condition](#safe-assignment-in-condition).
   When providing an accessor for a collection, provide an alternate form
   to save users from checking for `nil` before accessing an element in
   the collection.
-<sup>[[link](#provide-alternate-accessor-to_collections")]</sup>
+<sup>[[link](#provide-alternate-accessor-to-collections")]</sup>
 
   ```Ruby
   # bad