[bisq-network/bisq] Update contributing.md (#3613)

[Florian Reimair]

- no "optional" commit signing from now on
- added PR timeout information
You can view, comment on, or merge this pull request online at:

  https://github.com/bisq-network/bisq/pull/3613

-- Commit Summary --

  * Fixed spelling in Contributing.md
  * Added PR timeout info
  * Remove optional signing info

-- File Changes --

    M CONTRIBUTING.md (6)

-- Patch Links --

https://github.com/bisq-network/bisq/pull/3613.patch
https://github.com/bisq-network/bisq/pull/3613.diff

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