chore: git-ignore SDK docs

[disintegrator]

This change drops the .genignore rule for docs which didn't seem to be working and instead opts for adding /client/sdk/docs to the .gitignore file. This can be beneficial because speakeasy will still generate docs that are available to coding agents as context while not adding noise to source control.

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Project	Deployment	Actions	Updated (UTC)
gram-docs-redirect	Ready	Preview, Comment	Feb 4, 2026 6:44pm

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🚀 Preview Environment (PR #1492)

Preview URL: https://pr-1492.dev.getgram.ai

Component	Status	Details	Updated (UTC)
❌ Database	Blocked	Image build timed out	2026-02-04 19:51:27.
❌ Images	Failed	Timed out after 1180s waiting for images	2026-02-04 19:51:25.

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