doc/manuals: fix typo in interfaces.adoc: s/Omsocom/Osmocom/g
doc/manuals: fix typo in interfaces.adoc: s/Omsocom/Osmocom/g

Change-Id: I28d914f89a6de82a8e226a9772984cb0c9d8869a

osmocom/osmo-bts,osmocom/osmo-bts,osmocom/osmo-bts