doc: update some misleading/incorrect heading id attributes

Author: johnbartholomew

doc/learning/tools.html

@@ -169,7 +169,7 @@ <h2 id="formatter">Formatter Demo</h2>
 <div class="hgroup">
   <div class="hgroup-inline">
     <div class="panel">
-      <h2 id="formatter-linter">Linter</h2>
+      <h2 id="linter">Linter</h2>
     </div>
     <div style="clear: both"></div>
   </div>
@@ -194,7 +194,7 @@ <h2 id="formatter-linter">Linter</h2>
 <div class="hgroup">
   <div class="hgroup-inline">
     <div class="panel">
-      <h2 id="formatter-bazel">Bazel Jsonnet Rules</h2>
+      <h2 id="bazel-rules">Bazel Jsonnet Rules</h2>
     </div>
     <div style="clear: both"></div>
   </div>