Apply brand tone and writing style fixes

[mintlify]

Summary

Style fixes for recently changed docs pages.

Changes

• ai/model-context-protocol.mdx: Renamed Managing client credentials to Manage client credentials to match the imperative headings used elsewhere on the page.
• ai/model-context-protocol.mdx: Changed "The client secret is only shown once" and "This cannot be undone" to active voice.
• ai/llmstxt.mdx: Changed the llms-full.txt visibility sentence to active voice so it names Mintlify as the actor.
• components/visibility.mdx: Changed "The hidden content is still sent to every reader's browser" to active voice.
• cli/preview.mdx: Reordered the --signed-in sentence so it starts with the instruction, matching the --groups sentence above it.

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Note

Low Risk
Documentation wording only; no runtime, auth, or configuration behavior changes.

Overview
Docs-only copy edits across AI, CLI, and component pages to align with brand tone: active voice, imperative headings, and clearer instruction-first phrasing.

In ai/llmstxt.mdx, the llms-full.txt visibility sentence now states that Mintlify includes for="agents" content and excludes for="humans" content. ai/model-context-protocol.mdx renames Managing client credentials to Manage client credentials, and rewrites the one-time client secret and irreversible delete lines in active voice. components/visibility.mdx attributes delivery of hidden sign-in/group content to Mintlify. cli/preview.mdx leads the --signed-in explanation with the flag instruction, parallel to the --groups paragraph above.

No product behavior, APIs, or code paths change—only reader-facing wording.

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