use the npx version of jest-codemods in documentation (#8341)

docs/MigrationGuide.md

@@ -13,16 +13,10 @@ If you'd like to try out Jest with an existing codebase, there are a number of w
 
 If you are using [AVA](https://github.com/avajs/ava), [Chai](https://github.com/chaijs/chai), [Expect.js (by Automattic)](https://github.com/Automattic/expect.js), [Jasmine](https://github.com/jasmine/jasmine), [Mocha](https://github.com/mochajs/mocha), [proxyquire](https://github.com/thlorenz/proxyquire), [Should.js](https://github.com/shouldjs/should.js) or [Tape](https://github.com/substack/tape) you can use the third-party [jest-codemods](https://github.com/skovhus/jest-codemods) to do most of the dirty migration work. It runs a code transformation on your codebase using [jscodeshift](https://github.com/facebook/jscodeshift).
 
-Install Jest Codemods with `yarn` by running:
-
-```bash
-yarn global add jest-codemods
-```
-
 To transform your existing tests, navigate to the project containing the tests and run:
 
 ```bash
-jest-codemods
+npx jest-codemods
 ```
 
 More information can be found at [https://github.com/skovhus/jest-codemods](https://github.com/skovhus/jest-codemods).

website/versioned_docs/version-22.x/MigrationGuide.md

@@ -14,16 +14,10 @@ If you'd like to try out Jest with an existing codebase, there are a number of w
 
 If you are using [AVA](https://github.com/avajs/ava), [Chai](https://github.com/chaijs/chai), [Expect.js (by Automattic)](https://github.com/Automattic/expect.js), [Jasmine](https://github.com/jasmine/jasmine), [Mocha](https://github.com/mochajs/mocha), [proxyquire](https://github.com/thlorenz/proxyquire), [Should.js](https://github.com/tj/should.js/) or [Tape](https://github.com/substack/tape) you can use the third-party [jest-codemods](https://github.com/skovhus/jest-codemods) to do most of the dirty migration work. It runs a code transformation on your codebase using [jscodeshift](https://github.com/facebook/jscodeshift).
 
-Install Jest Codemods with `yarn` by running:
-
-```bash
-yarn global add jest-codemods
-```
-
 To transform your existing tests, navigate to the project containing the tests and run:
 
 ```bash
-jest-codemods
+npx jest-codemods
 ```
 
 More information can be found at [https://github.com/skovhus/jest-codemods](https://github.com/skovhus/jest-codemods).

website/versioned_docs/version-24.6/MigrationGuide.md

@@ -14,16 +14,10 @@ If you'd like to try out Jest with an existing codebase, there are a number of w
 
 If you are using [AVA](https://github.com/avajs/ava), [Chai](https://github.com/chaijs/chai), [Expect.js (by Automattic)](https://github.com/Automattic/expect.js), [Jasmine](https://github.com/jasmine/jasmine), [Mocha](https://github.com/mochajs/mocha), [proxyquire](https://github.com/thlorenz/proxyquire), [Should.js](https://github.com/shouldjs/should.js) or [Tape](https://github.com/substack/tape) you can use the third-party [jest-codemods](https://github.com/skovhus/jest-codemods) to do most of the dirty migration work. It runs a code transformation on your codebase using [jscodeshift](https://github.com/facebook/jscodeshift).
 
-Install Jest Codemods with `yarn` by running:
-
-```bash
-yarn global add jest-codemods
-```
-
 To transform your existing tests, navigate to the project containing the tests and run:
 
 ```bash
-jest-codemods
+npx jest-codemods
 ```
 
 More information can be found at [https://github.com/skovhus/jest-codemods](https://github.com/skovhus/jest-codemods).