Fix alphaVersion rendering issue in operations/_index.md

Change alphaVersion from 'v2.0-preview' to '2.0' to avoid
double 'v' rendering in the documentation.

Signed-off-by: Nic Cope <[email protected]>

Author: negz

content/master/operations/_index.md

@@ -2,6 +2,6 @@
 title: Operations
 weight: 52
 state: alpha
-alphaVersion: v2.0-preview
+alphaVersion: 2.0
 description: Understand Crossplane's Operations feature
 ---