message: Update repo_guidelines.md
  typo, cla -> dco
diff: @@ -10,7 +10,7 @@ The ONNX GitHub organization contains a number of repositories. Every repository
  * Must be actively maintained
  * Must adopt the ONNX Code of Conduct
  * Must adopt the standard ONNX license(s)
  -* Must adopt the ONNX CLA bot
  +* Must adopt the ONNX DCO bot
  * Must adopt all ONNX automation (like LGTM)
  * Must have CI or other automation in place for repos containing code to ensure quality
  * All OWNERS must be members of standing as defined by ability to vote in Steering Committee elections.
  @@ -22,9 +22,9 @@ We are happy to accept contributions as repos under the ONNX organization of new
  * Project is closely related to ONNX
  * Adds value to the ONNX ecosystem
  * Determined to need a new repo rather than a folder in an existing repo
  -* All contributors must have signed the ONNX CLA
  +* All contributors must have signed the ONNX DCO
  * Licenses of dependencies must be acceptable
  -* Committment to maintain the repo
  +* Commitment to maintain the repo
  * Approval of the SIG that will own the repo
  * Approval of the Steering Committee
  