docs: fix typos

Closes issues edicl#22 and edicl#23.

docs/index.html

@@ -454,12 +454,12 @@ <h4>Look at the character entities generated by this example</h4><p style='backg
 <p>
 CL-WHO will usually try not to insert any unnecessary whitespace in
 order to save bandwidth. However, if <code><i>indent</i></code>
-is <em>true</em> line breaks will be inserted and nested tags will be
+is <em>true</em>, line breaks will be inserted and nested tags will be
 indented properly. The value of <code><i>indent</i></code> - if it is
 an integer - will be taken as the initial indentation. If it is not an
 integer it is assumed to mean <code>0</code>. Value
 of <a href="#*html-no-indent-tags*"><code>*HTML-NO-INDENT-TAGS*</code></a>
-controls which tag-contents are excempt from indentation: by default
+controls which tag-contents are exempt from indentation: by default
 contents of <code>PRE</code> and <code>TEXTAREA</code> tags are not
 indented to avoid spurious layout changes. (Note: in certain
 situations additional whitespace may change the layout of tables.)
@@ -560,7 +560,7 @@ <h4>Look at the character entities generated by this example</h4><p style='backg
 <blockquote><br>
 The list of HTML tags that should disable indentation inside them even
 when indentation is requested. The initial value is a list containing
-only <code>:pre</code> and <code>:texarea</code>.
+only <code>:pre</code> and <code>:textarea</code>.
 </blockquote>
 
 <p><br>[Special variable]