Update README.md
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 This documentation was generated using the
 [Project Trellis tools](https://github.com/SymbiFlow/prjtrellis).
 
-# Contributions
-
-As this repo is created from the prjtrellis output it doesn't accept external
-contributions.  You are encourage to generate and maintain your own versions of
-this documentation if your needs are not being met by this repository.
-
 # License
 
 These files are released under the very permissive [CC0 1.0 Universal](COPYING).