[offlineimap] docs: expand documentation of the gmail labels syncing (#166)

[Abdó Roig-Maranges]

- Suggest that this works well together with email indexing

- Warn about modifying the labelsheader after a sync

- In the example replace X-Gmail-Keywords by X-Keywords. I think this is
  misleading, since no email client will pick up X-Gmail-Keywords, while
  X-Keywords (the default) is recognized by some.

- add paragraph explaining special gmail labels.
You can view, comment on, or merge this pull request online at:

  https://github.com/OfflineIMAP/offlineimap/pull/166

-- Commit Summary --

  * docs: expand documentation of the gmail labels syncing

-- File Changes --

    M docs/MANUAL.rst (30)

-- Patch Links --

https://github.com/OfflineIMAP/offlineimap/pull/166.patch
https://github.com/OfflineIMAP/offlineimap/pull/166.diff

---
Reply to this email directly or view it on GitHub:
https://github.com/OfflineIMAP/offlineimap/pull/166
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