cmd/compile/internal/ssa: match style and formatting

[willfaught]

Format final sentence in paragraph and make sentence case to match style.

[gopherbot]

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[gopherbot]

Message from Gopher Robot:

Patch Set 1:

(1 comment)

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[gopherbot]

Message from Jorropo:

Patch Set 1: Auto-Submit+1 Code-Review+2 Commit-Queue+1

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Message from Go LUCI:

Patch Set 1:

Dry run: CV is trying the patch.

Bot data: {"action":"start","triggered_at":"2025-09-20T01:10:28Z","revision":"cfb585d7ce9b3d2f2508e12eec049185a41bd154"}

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Message from Jorropo:

Patch Set 1: -Commit-Queue

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Message from Go LUCI:

Patch Set 1:

This CL has passed the run

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Message from Go LUCI:

Patch Set 1: LUCI-TryBot-Result+1

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Message from t hepudds:

Patch Set 1:

(1 comment)

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Message from Michael Knyszek:

Patch Set 1: Code-Review+2

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[gopherbot]

This PR is being closed because golang.org/cl/705519 has been merged.