Clarify that a piece of text in the navigation handler section of the spec only pertains when inside of a flow.

Consider this spec text, from section 7.4.2:

> If the element is a non-view flow node, resolve it to a vdl view identifier by following the algorithm in Section 7.4.2.1 "Requirements for Explicit Navigation in Faces Flow Call Nodes other than ViewNodes".

That text only pertains to navigation within a flow. This restriction must be explicitly called out.
#### Affected Versions
[2.2]

Read section 7.4.2 and the referenced section 7.4.2.1 of the Jakarta Faces specification, focusing on the quoted navigation-handler text. Update the wording to state that it applies only to navigation within a flow, then verify the surrounding requirements remain consistent.

Written by the indexing model from the issue text.