control/controlhttp: rename a param from addr to optAddr for clarity

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And update docs.

Updates #cleanup
Updates #13597 (tangentially; noted this cleanup while debugging)

Change-Id: I62440294c78b0bb3f5673be10318dd89af1e1bfe
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

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500 Internal Server Error

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