Fix typo in doc (#6454)

"Collocation" insead of "Colocation".

docusaurus/docs/running-tests.md

@@ -25,7 +25,7 @@ Jest will look for test files with any of the following popular naming conventio
 
 The `.test.js` / `.spec.js` files (or the `__tests__` folders) can be located at any depth under the `src` top level folder.
 
-We recommend to put the test files (or `__tests__` folders) next to the code they are testing so that relative imports appear shorter. For example, if `App.test.js` and `App.js` are in the same folder, the test just needs to `import App from './App'` instead of a long relative path. Colocation also helps find tests more quickly in larger projects.
+We recommend to put the test files (or `__tests__` folders) next to the code they are testing so that relative imports appear shorter. For example, if `App.test.js` and `App.js` are in the same folder, the test just needs to `import App from './App'` instead of a long relative path. Collocation also helps find tests more quickly in larger projects.
 
 ## Command Line Interface