npm-{install-test, link, explain}: add option placeholders (#19910)

pages/common/npm-explain.md

@@ -5,16 +5,16 @@
 
 - Explain why a specific package is installed:
 
-`npm explain {{package_name}}`
+`npm {{[why|explain]}} {{package_name}}`
 
 - Show explanation in JSON format:
 
-`npm explain {{package_name}} --json`
+`npm {{[why|explain]}} {{package_name}} --json`
 
 - Include peer dependencies in the explanation:
 
-`npm explain {{package_name}} --include peer`
+`npm {{[why|explain]}} {{package_name}} --include peer`
 
 - Limit explanation depth to 2 levels deep:
 
-`npm explain {{package_name}} --depth 2`
+`npm {{[why|explain]}} {{package_name}} --depth 2`

pages/common/npm-install-test.md

@@ -6,16 +6,16 @@
 
 - Install all dependencies and then run tests:
 
-`npm install-test`
+`npm {{[it|install-test]}}`
 
 - Install a specific package and then run tests:
 
-`npm install-test {{package_name}}`
+`npm {{[it|install-test]}} {{package_name}}`
 
 - Install a package and save it as a dependency before running tests:
 
-`npm install-test {{package_name}} {{[-S|--save]}}`
+`npm {{[it|install-test]}} {{package_name}} {{[-S|--save]}}`
 
 - Install dependencies globally and then run tests:
 
-`npm install-test {{[-g|--global]}}`
+`npm {{[it|install-test]}} {{[-g|--global]}}`

pages/common/npm-link.md

@@ -5,12 +5,12 @@
 
 - Symlink the current package globally:
 
-`npm link`
+`npm {{[ln|link]}}`
 
 - Link a globally linked package into another project's `node_modules`:
 
-`npm link {{package_name}}`
+`npm {{[ln|link]}} {{package_name}}`
 
 - Unlink a package from the current project:
 
-`npm unlink {{package_name}}`
+`npm {{[r|unlink]}} {{package_name}}`