[+]: update the README

Author: voku

README.md

@@ -3,11 +3,26 @@
 
 This is a experiment! Lets check and fix the php documentation automatically.
 
+### install
 ```bash
 git clone https://github.com/php/doc-en.git
 git clone https://github.com/php/php-src.git // optional: by default we use the PhpStorm Stubs
 git clone https://github.com/voku/php-doc-fixer.git
 cd php-doc-fixer/
 composer update --prefer-dist
+```
+
+### command
+```
 php bin/phpdocfixer run [--auto-fix="true"] [--remove-array-value-info="true"] [--stubs-path="../php-src/"] [--stubs-file-extension=".stub.php"] ../doc-en/reference/
 ```
+
+### example: sync types from PhpStorm Stubs into the php-documentation
+```
+php bin/phpdocfixer run --auto-fix="true" --remove-array-value-info="true" ../doc-en/reference/
+```
+
+### example: sync types from php-src into the php-documentation, but only for BCMath (bc)
+```
+php bin/phpdocfixer run --auto-fix="true" --stubs-path="../php-src/" --stubs-file-extension=".stub.php" ../doc-en/reference/bc/
+```