doc/manuals: update MmeItem related info
The osmo-s1gw-cli documentation was not properly updated in 63ce2c9:
* default local/bind address for an MME is "any", not "::"
* allowed TACs (--tac) was missing in help and examples
Change-Id: I0b8115fe6342a80bf1eb99bd6ad210492a013947
Fixes: 63ce2c9 ("[REST] Add MmeList, MmeAdd, MmeInfo, MmeDelete")
Related: OS#6671
