Update description of git_basic_auth_policy field in AuthInfo
Update description of git_basic_auth_policy field in AuthInfo

There was a mismatch with what is documented for the
auth.gitBasicAuthPolicy parameter in gerrit.config.

Change-Id: I9d34af443419f09320083bd984feb966fcfe86f7
Signed-off-by: Edwin Kempin <d43fb6c98c97e553b671ed9a9318100f1de386e7@google.com>

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