Add serializer fields documentation

docs/index.md

@@ -81,6 +81,7 @@ The API guide is your complete reference manual to all the functionality provide
 * [Parsers][parsers]
 * [Renderers][renderers]
 * [Serializers][serializers]
+* [Serializer fields][fields]
 * [Authentication][authentication]
 * [Permissions][permissions]
 * [Throttling][throttling]
@@ -159,6 +160,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 [parsers]: api-guide/parsers.md
 [renderers]: api-guide/renderers.md
 [serializers]: api-guide/serializers.md
+[fields]: api-guide/fields.md
 [authentication]: api-guide/authentication.md
 [permissions]: api-guide/permissions.md
 [throttling]: api-guide/throttling.md

docs/template.html

@@ -53,6 +53,7 @@
                   <li><a href="{{ base_url }}/api-guide/parsers{{ suffix }}">Parsers</a></li>
                   <li><a href="{{ base_url }}/api-guide/renderers{{ suffix }}">Renderers</a></li>
                   <li><a href="{{ base_url }}/api-guide/serializers{{ suffix }}">Serializers</a></li>
+                  <li><a href="{{ base_url }}/api-guide/fields{{ suffix }}">Serializer fields</a></li>
                   <li><a href="{{ base_url }}/api-guide/authentication{{ suffix }}">Authentication</a></li>
                   <li><a href="{{ base_url }}/api-guide/permissions{{ suffix }}">Permissions</a></li>
                   <li><a href="{{ base_url }}/api-guide/throttling{{ suffix }}">Throttling</a></li>