cmd/compile/internal/ssa: match style and formatting
Format final sentence in paragraph and make sentence case to match style.
Change-Id: I991729257fea202509f59a928b943e10ef1761f4
GitHub-Last-Rev:
770bbf5e7507c0a296f28cb667f0b022a1df846a
GitHub-Pull-Request: golang/go#75550
Reviewed-on: https://go-review.googlesource.com/c/go/+/705519
Reviewed-by: Jorropo <jorropo.pgm@gmail.com>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Jorropo <jorropo.pgm@gmail.com>