Remove r3.1.0-rc0 API documentation

Author: jrassi

etc/apidocmenu.md

@@ -17,11 +17,11 @@ Currently, no drivers guarantee API or ABI stability.
 | mongocxx                             | legacy
 | -------------------------------------| --------------------------------
 | [mongocxx-3.1.0](../mongocxx-3.1.0/) | [legacy-1.1.2](../legacy-1.1.2/)
-| [mongocxx-3.1.0-rc0](../mongocxx-3.1.0-rc0/) | [legacy-1.1.1](../legacy-1.1.1/)
-| [mongocxx-3.0.3](../mongocxx-3.0.3/) | [legacy-1.1.0](../legacy-1.1.0/)
-| [mongocxx-3.0.2](../mongocxx-3.0.2/) | [legacy-1.0.7](../legacy-1.0.7/)
-| [mongocxx-3.0.1](../mongocxx-3.0.1/) | [legacy-1.0.6](../legacy-1.0.6/)
-| [mongocxx-3.0.0](../mongocxx-3.0.0/) | [legacy-1.0.5](../legacy-1.0.5/)
+| [mongocxx-3.0.3](../mongocxx-3.0.3/) | [legacy-1.1.1](../legacy-1.1.1/)
+| [mongocxx-3.0.2](../mongocxx-3.0.2/) | [legacy-1.1.0](../legacy-1.1.0/)
+| [mongocxx-3.0.1](../mongocxx-3.0.1/) | [legacy-1.0.7](../legacy-1.0.7/)
+| [mongocxx-3.0.0](../mongocxx-3.0.0/) | [legacy-1.0.6](../legacy-1.0.6/)
+|                                      | [legacy-1.0.5](../legacy-1.0.5/)
 |                                      | [legacy-1.0.4](../legacy-1.0.4/)
 |                                      | [legacy-1.0.3](../legacy-1.0.3/)
 |                                      | [legacy-1.0.2](../legacy-1.0.2/)

etc/generate-all-apidocs.pl

@@ -33,7 +33,6 @@ sub _try_run {
   r3.0.1
   r3.0.2
   r3.0.3
-  r3.1.0-rc0
   r3.1.0
 );