Fix a typo/wordsmith a description modified in r343407

r343407 accidentally introduced a typo (folling -> following). While
reading the change out loud, I realized that the original sentence was
wordy. almost sounding like a run-on sentence.

Improve the flow by splitting up the two thoughts into two distinct sentence
fragments.

PR: 194547, 208497
Reviewed by: emaste
Approved by: emaste (mentor)
MFC after: 1 month
MFC with: r343407
Differential Revision: https://reviews.freebsd.org/D18947