Add note about TOLERANCE and OGC API - Features requests (#1103)

Author: geographika

en/mapfile/layer.txt

@@ -1876,14 +1876,14 @@ TILESRS [attribute]
 .. _TOLERANCE:
 
 TOLERANCE [double]
-    Sensitivity for point based queries (i.e. via mouse and/or map
-    coordinates). Given in TOLERANCEUNITS. If the layer is a POINT or a LINE,
-    the default is 3. For all other layer types, the default is 0.  To
-    restrict polygon searches so that the point must occur in the polygon
-    set the tolerance to zero. This setting does not apply to WFS GetFeature
-    operations.
-
-    .. note:: Starting with MapServer 8.6, the TOLERANCE value can also be
+    Sensitivity for point-based queries (i.e. via mouse and/or map
+    coordinates). Given in :ref:`TOLERANCEUNITS <mapfile-layer-toleranceunits>`.
+    If the layer is a POINT or a LINE, the default is 3. For all other layer types, the default is 0.
+    To restrict polygon searches so that the point must occur in the polygon,
+    set the tolerance to zero. This setting does not apply to WFS GetFeature operations
+    or OGC API - Features requests.
+
+    .. note:: Starting with MapServer 8.6, the ``TOLERANCE`` value can also be
               defined as a :ref:`child of an IDENTIFY block <identify_tolerance>`.
 
 .. index::