The "ADM PIN" and "SCP02 / SCP03" sub-sections of "Field naming" used
the '~' heading character, which Sphinx resolved to level 4 - skipping
level 3 and throwing build ERRORs. As a result, both sub-sections
had no heading at all. Change both to '^' (level 3) to match the
other sub-sections in this file.
While at it, fix a typo: "consisting if" -> "consisting of".
Change-Id: Ia56efc7fadcc0fd62e87e63850b929d2f80851ba
74ac191ae6