DOCS-15809 Fixes typo (#107)

Author: kennethdyer

source/reference/api/start.txt

@@ -151,7 +151,7 @@ The ``sharding`` option has the following parameters:
      - Type
      - Description
 
-   * - ``createSupportedIndexes``
+   * - ``createSupportingIndexes``
      - boolean
      - Optional. Sets whether sync creates a supporting index 
        for the shard key, if none exists.  Defaults to ``false``.