typo fix (#4561)

Summary:
my first no-longer-at-meta contrib is of course a typo fix.

Pull Request resolved: #4561

Reviewed By: monicatang

Differential Revision: D52629664

Pulled By: captbaritone

fbshipit-source-id: 0063454800e8814776a1a1744a8d687e85704647

website/versioned_docs/version-v16.0.0/guides/relay-resolvers.md

@@ -86,7 +86,7 @@ The Relay compiler looks for the following fields in any docblocks that includes
 
 The docblock may also contain free text. This free text will be used as the field’s human-readable description, which will be surfaced in Relay’s editor support on hover and in autocomplete results.
 
-## Relay Resolver Convetions
+## Relay Resolver Conventions
 
 In order for Relay to be able to call a Relay Resolver, it must conform to a set of conventions: