Fix a typo

Co-authored-by: Raúl Cumplido <raulcumplido@gmail.com>

Author: kou

dev/release/README.md

@@ -45,7 +45,7 @@ $ GH_TOKEN=${YOUR_GITHUB_TOKEN} dev/release/bump_version.sh 19.0.0
 ```
 
 It creates a feature branch and adds a commit that bumps version. This
-opens a pull request from the feature branch by `gh gr create`. So you
+opens a pull request from the feature branch by `gh pr create`. So you
 need `gh` command and GitHub personal access token.
 
 See also: