Fix some broken links

docs/source/devtools/editor-plugins.md

@@ -16,7 +16,7 @@ The extension enables you to:
 - Validate field and argument usage in operations
 - [Navigate projects more easily](#navigating-projects) with jump-to and peek-at definitions
 - Manage [client-only](#client-only-schemas) schemas
-- [Switch schema tags](#schema-variant-switching) to work with schemas running on different environments
+- [Switch graph variants](#graph-variant-switching) to work with schemas running on different environments
 
 ## Getting started
 
@@ -70,7 +70,7 @@ module.exports = {
 };
 ```
 
-Linking to the local schema won't provide all features such as switching schema tags and performance metrics. See [the Apollo config docs][] for more details on configuration options.
+Linking to the local schema won't provide all features, such as switching graph variants and performance metrics. See [the Apollo config docs](./apollo-config/) for more details on configuration options.
 
 ### Client-only schemas
 
@@ -144,9 +144,7 @@ Apollo supports publishing multiple versions ([variants](https://www.apollograph
 
 ## Troubleshooting
 
-The most common errors are configuration errors, like a missing `.env` file or incorrect service information in the `apollo.config.js` file. Please see [the Apollo config docs][] for more configuration guidance.
-
-[the Apollo config docs]: https://www.apollographql.com/docs/references/apollo-config/
+The most common errors are configuration errors, like a missing `.env` file or incorrect service information in the `apollo.config.js` file. Please see [the Apollo config docs](./apollo-config/) for more configuration guidance.
 
 Other errors may be caused from an old version of a published schema. To reload a schema, open the Command Palette (`cmd + shift + p` on mac), search "Apollo" and choose the "Apollo: Reload Schema" option.