Update fern/docs/pages/references/build-config.mdx

Co-authored-by: Ben Colborn <[email protected]>

Author: starlightknown

fern/docs/pages/references/build-config.mdx

@@ -1,7 +1,7 @@
 The build configuration is used to configure the build process of the snap-in. For example, it can be used to set the environment variables used during the build process.
 
 This is useful if the developer wants to import libraries from a different registry or wants to use private packages that
-requires an authentication token.
+require an authentication token.
 
 ## Specifying the Config