docs: fix grammar in configuration file resolution (#18419)

docs/src/use/configure/configuration-files.md

@@ -444,7 +444,7 @@ For more information on how to combine shareable configs with your preferences,
 
 ## Configuration File Resolution
 
-When ESLint is run on the command line, it first checks the current working directory for `eslint.config.js`. If that file is found, then the search stops, otherwise it checks for `eslint.config.mjs`. If that file is found, then the search stops, otherwise it checks for `eslint.config.cjs`. If none of the files are not found, it checks the parent directory for each file. This search continues until either a config file is found or the root directory is reached.
+When ESLint is run on the command line, it first checks the current working directory for `eslint.config.js`. If that file is found, then the search stops, otherwise it checks for `eslint.config.mjs`. If that file is found, then the search stops, otherwise it checks for `eslint.config.cjs`. If none of the files are found, it checks the parent directory for each file. This search continues until either a config file is found or the root directory is reached.
 
 You can prevent this search for `eslint.config.js` by using the `-c` or `--config` option on the command line to specify an alternate configuration file, such as: