[Trivial] Fix documentation typos

std/xml.d

@@ -883,7 +883,7 @@ class Element : Item
         /**
          * Returns the decoded interior of an element.
          *
-         * The element is assumed to containt text <i>only</i>. So, for
+         * The element is assumed to contain text <i>only</i>. So, for
          * example, given XML such as "&lt;title&gt;Good &amp;amp;
          * Bad&lt;/title&gt;", will return "Good &amp; Bad".
          *
@@ -1289,7 +1289,7 @@ class CData : Item
     private string content;
 
     /**
-     * Construct a chraracter data section
+     * Construct a character data section
      *
      * Params:
      *      content = the body of the character data segment
@@ -1831,7 +1831,7 @@ class ElementParser
     /**
      * Register an alternative handler which will be called whenever text
      * is encountered. This differs from onText in that onText will decode
-     * the text, wheras onTextRaw will not. This allows you to make design
+     * the text, whereas onTextRaw will not. This allows you to make design
      * choices, since onText will be more accurate, but slower, while
      * onTextRaw will be faster, but less accurate. Of course, you can
      * still call decode() within your handler, if you want, but you'd
@@ -1856,7 +1856,7 @@ class ElementParser
 
     /**
      * Register a handler which will be called whenever a character data
-     * segement is encountered.
+     * segment is encountered.
      *
      * Examples:
      * --------------
@@ -1924,7 +1924,7 @@ class ElementParser
      * Examples:
      * --------------
      * // Call this function whenever an XML instruction is encountered
-     * // (Note: XML instructions may only occur preceeding the root tag of a
+     * // (Note: XML instructions may only occur preceding the root tag of a
      * // document).
      * onPI = (string s)
      * {
@@ -2624,7 +2624,7 @@ private
  *
  * Throws: CheckException if the document is not well formed
  *
- * CheckException's toString() method will yield the complete heirarchy of
+ * CheckException's toString() method will yield the complete hierarchy of
  * parse failure (the XML equivalent of a stack trace), giving the line and
  * column number of every failure at every level.
  */
@@ -2781,7 +2781,7 @@ class TagException : XMLException
  */
 class CheckException : XMLException
 {
-    CheckException err; /// Parent in heirarchy
+    CheckException err; /// Parent in hierarchy
     private string tail;
     /**
      * Name of production rule which failed to parse,