doc: fix grammer (#22791)

docs/contributing/community.md

@@ -13,7 +13,7 @@ One of our community's values is that ["you belong here"](/blog/2018-09-07-gatsb
 ## Gatsby Contributor Covenant Code of Conduct
 
 In the interest of fostering an open and welcoming environment, we as
-contributors and maintainers pledge to making participation in our project and
+contributors and maintainers pledge to make participation in our project and
 our community a harassment-free experience for everyone, regardless of age, body
 size, disability, ethnicity, gender identity and expression, level of
 experience, nationality, personal appearance, race, religion, or sexual identity