docs: tighten style in workflows pages

[mintlify]

Summary

Minor style cleanup on the recently added workflows pages to keep voice and sentence length consistent with the rest of the docs.

Changes

• workflows/reference.mdx — split two 30+ word sentences in Update from code changes and Maintenance workflows.
• guides/use-workflows.mdx — split a 40-word sentence in Control credit usage into two.
• workflows/manage.mdx — rephrase passive "must be installed" to active "install" for the Mintlify GitHub App note.

Context

Reviewed the workflow pages added in #6023 against the rest of the English docs for second-person voice, active voice, sentence length, heading capitalization (sentence case), and click/select terminology. Headings, voice, and terminology already match the predominant style — only a few long sentences and one passive-voice construction needed adjustment.

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Note

Low Risk
Editorial MDX changes only; no runtime, auth, or configuration logic affected.

Overview
Documentation-only copy edits on three workflows-related pages—no product or behavior changes.

In guides/use-workflows.mdx, the Control credit usage section replaces one long sentence with two shorter ones and adds a contrast between scheduled runs (predictable PR volume) and push-triggered runs (variable month-to-month).

In workflows/reference.mdx, Update from code changes tightens wording for the per-PR trigger (e.g. “opens” instead of “creates,” “code change” instead of “source code pull request”). Maintenance workflows splits a long schedule-vs-trigger sentence and frames the schedule tradeoff explicitly.

In workflows/manage.mdx, the context repositories note switches from passive “must be installed” to imperative install the Mintlify GitHub App.

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