Move description of some account REST endpoints into the correct section
Move description of some account REST endpoints into the correct section

The List Contributor Agreements, Sign Contributor Agreement and Index
Account REST endpoints were wrongly listed in the 'Star Endpoints'
section but they belong into the 'Account Endpoints' section.

Change-Id: I3eff7f3cd34f6e011860d786ed0844db7c5faab9
Signed-off-by: Edwin Kempin <d43fb6c98c97e553b671ed9a9318100f1de386e7@google.com>

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