New Styleguides page does not scroll properly when you click

on "Cogs"

fixes: CNVS-18169

Test Plan:
- Go to /styleguide
- Click on "Cogs" under Components; it should now scroll to the
correct place

Change-Id: If1f104fb84934a489a6df6783ccda85eeb1715e7
Reviewed-on: https://gerrit.instructure.com/48675
Tested-by: Jenkins
Reviewed-by: Chris Hart <chart@instructure.com>
QA-Review: Nathan Rogowski <nathan@instructure.com>
Product-Review: Colleen Palmer <colleen@instructure.com>

app/stylesheets/components/_admin_links.scss

@@ -1,6 +1,6 @@
 
 /*
-@styleguide Cogs (Admin Dropdowns)
+@styleguide Cogs
 
 <br/>
 
@@ -184,4 +184,4 @@ For admin dropdowns that appear in main content areas, such as item groups, plea
 
 .al-hover-container:hover, .al-hover-container-active {
   .al-trigger { z-index: 0; }
-}
+}

doc/styleguide/template.mustache

@@ -15,7 +15,7 @@
     <section class="Sg-Navigation--Components">
       <a class="Sg-header__Subnavigation-item" href="#accordion">Accordion</a>
       <a class="Sg-header__Subnavigation-item" href="#autocomplete">Autocomplete</a>
-      <a class="Sg-header__Subnavigation-item" href="#cogs_(admin_dropdowns)">Cogs</a>
+      <a class="Sg-header__Subnavigation-item" href="#cogs">Cogs</a>
       <a class="Sg-header__Subnavigation-item" href="#element_toggler">Element Toggler</a>
       <a class="Sg-header__Subnavigation-item" href="#expanding_message_link">Expanding Message Link</a>
       <a class="Sg-header__Subnavigation-item" href="#item_groups">Item Groups</a>