chore: [change-1188] Update CODEOWNERS with team-fm-govern (#577)

Update `team-enterprise` with `team-fm-govern`.

Author: phillld

CODEOWNERS

@@ -1,12 +1,12 @@
 # https://help.github.com/en/github/creating-cloning-and-archiving-repositories/about-code-owners
 
-* @launchdarkly/team-enterprise
+* @launchdarkly/team-fm-govern
 
 # Documentation
 *.md @launchdarkly/team-docs
 
 # vendor docs don't need to be owned by docs team
-vendor/ @launchdarkly/team-enterprise
+vendor/ @launchdarkly/team-fm-govern
 
 # Change log is updated by release bot
-CHANGELOG.md @launchdarkly/team-enterprise
+CHANGELOG.md @launchdarkly/team-fm-govern