More 404 link fixes. (#29434)

docs/3.3/examples/grid/index.html

@@ -118,7 +118,7 @@
       <hr>
 
       <h3>Column clearing</h3>
-      <p><a href="https://getbootstrap.com/css/#grid-responsive-resets">Clear floats</a> at specific breakpoints to prevent awkward wrapping with uneven content.</p>
+      <p><a href="../../css/#grid-responsive-resets">Clear floats</a> at specific breakpoints to prevent awkward wrapping with uneven content.</p>
       <div class="row">
         <div class="col-xs-6 col-sm-3">
           .col-xs-6 .col-sm-3

docs/3.4/about/index.html

@@ -195,7 +195,7 @@
       </div>
     
   </div>
-  <p>Get involved with Bootstrap development by <a href="https://github.com/twbs/bootstrap/issues/new">opening an issue</a> or submitting a pull request. Read our <a href="https://github.com/twbs/bootstrap/blob/master/CONTRIBUTING.md">contributing guidelines</a> for information on how we develop.</p>
+  <p>Get involved with Bootstrap development by <a href="https://github.com/twbs/bootstrap/issues/new">opening an issue</a> or submitting a pull request. Read our <a href="https://github.com/twbs/bootstrap/blob/v3.4.1/CONTRIBUTING.md">contributing guidelines</a> for information on how we develop.</p>
 
   <h2 id="team-sass">Sass team</h2>
   <div class="list-group bs-team">

docs/4.2/examples/navbar-bottom/index.html

@@ -8,7 +8,7 @@
     <meta name="generator" content="Jekyll v3.8.5">
     <title>Bottom navbar example · Bootstrap</title>
 
-    <link rel="canonical" href="https://getbootstrap.com/docs/4.2/examples/navbar/">
+    <link rel="canonical" href="https://getbootstrap.com/docs/4.2/examples/navbar-bottom/">
 
     <!-- Bootstrap core CSS -->
 <link href="/docs/4.2/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-GJzZqFGwb1QTTN6wy59ffF1BuGJpLSa9DkKMp0DgiMDm4iYMj70gZWKYbI706tWS" crossorigin="anonymous">