Revert "Rename pre-insertion"

This reverts commit 5c87649.

dom.bs

@@ -2583,7 +2583,7 @@ steps:
 <h4 id=mutation-algorithms>Mutation algorithms</h4>
 
 <p>To
-<dfn export for=Node id=concept-node-ensure-pre-insert-validity>ensure pre-insert validity</dfn>
+<dfn export for=Node id=concept-node-ensure-pre-insertion-validity>ensure pre-insertion validity</dfn>
 of a <var>node</var> into a <var>parent</var> before a <var>child</var>, run these steps:
 
 <ol>
@@ -2638,7 +2638,7 @@ of a <var>node</var> into a <var>parent</var> before a <var>child</var>, run the
 <var>parent</var> before a <var>child</var>, run these steps:
 
 <ol>
- <li><p><a>Ensure pre-insert validity</a> of <var>node</var> into <var>parent</var> before
+ <li><p><a>Ensure pre-insertion validity</a> of <var>node</var> into <var>parent</var> before
  <var>child</var>.
 
  <li><p>Let <var>referenceChild</var> be <var>child</var>.
@@ -2699,7 +2699,7 @@ of a <var>node</var> into a <var>parent</var> before a <var>child</var>, run the
 </ol>
 
 <p class=note>The <a>ensure pre-move validity</a> steps are a similar, but slightly stricter version
-of the <a>ensure pre-insert validity</a> steps.</p>
+of the <a>ensure pre-insertion validity</a> steps.</p>
 
 <p>To <dfn export id=concept-node-pre-move>pre-move</dfn> a <var>node</var> into a
 <var>parent</var> before a <var>child</var>, run these steps:
@@ -3418,7 +3418,7 @@ are:
  <li><p>Let <var>node</var> be the result of <a>converting nodes into a node</a> given <a>this</a>,
  <var>nodes</var>, and <a>this</a>'s <a for=Node>node document</a>.
 
- <li><p><a>Ensure pre-insert validity</a> of <var>node</var> into <a>this</a> before
+ <li><p><a>Ensure pre-insertion validity</a> of <var>node</var> into <a>this</a> before
  null.
 
  <li><p><a for=Node>Replace all</a> with <var>node</var> within <a>this</a>.
@@ -9217,12 +9217,12 @@ result of <a for="live range">cloning the contents</a> of <a>this</a>.
  <!-- IE9 and Chrome 12 dev throw an exception before splitting the text
  node if the insertBefore() is going to throw an exception (at least if the
  new node is the parent of the start node, for instance). Firefox 4.0 and
- Opera 11.00 don't.  Now that we have "ensure pre-insert validity," we go
+ Opera 11.00 don't.  Now that we have "ensure pre-insertion validity," we go
  with the IE/Chrome behavior because it's more correct.
 
  IE9 doesn't call splitText() if the offset is 0. This makes sense, but I go
  with what all other browsers do. -->
- <li><a>Ensure pre-insert validity</a>
+ <li><a>Ensure pre-insertion validity</a>
  of <var>node</var> into <var>parent</var> before
  <var>referenceNode</var>.