Fix: typo: missing word in docs (#11750)

Author: dimitropoulos

docs/developer-guide/working-with-rules.md

@@ -137,7 +137,7 @@ Additionally, the `context` object has the following methods:
     * If the node is an `ImportSpecifier`, `ImportDefaultSpecifier`, or `ImportNamespaceSpecifier`, the declared variable is returned.
     * Otherwise, if the node does not declare any variables, an empty array is returned.
 * `getFilename()` - returns the filename associated with the source.
-* `getScope()` - returns the [scope](./scope-manager-interface.md#scope-interface) of the currently-traversed node. This information can be used track references to variables.
+* `getScope()` - returns the [scope](./scope-manager-interface.md#scope-interface) of the currently-traversed node. This information can be used to track references to variables.
 * `getSourceCode()` - returns a [`SourceCode`](#contextgetsourcecode) object that you can use to work with the source that was passed to ESLint.
 * `markVariableAsUsed(name)` - marks a variable with the given name in the current scope as used. This affects the [no-unused-vars](../rules/no-unused-vars.md) rule. Returns `true` if a variable with the given name was found and marked as used, otherwise `false`.
 * `report(descriptor)` - reports a problem in the code (see the [dedicated section](#contextreport)).