Fix errors spotted by Rusty

Author: Kévin Gomez

doc/custom_operators.md

@@ -19,7 +19,7 @@ $executor = new ArrayExecutor([
 
 $executor->registerOperators([
     'logged' => function($user) {
-        return return $user::CONNECTED === $user->getStatus();
+        return $user::CONNECTED === $user->getStatus();
     },
 ]);
 ```

doc/index.md

@@ -6,6 +6,7 @@ Getting started with RulerZ
 The recommended way to install this library is with [Composer](http://getcomposer.org/):
 
 ```
+# ignore
 composer require 'kphoen/rulerz'
 ```
 

doc/writing_rules.md

@@ -34,7 +34,7 @@ use RulerZ\Compiler\Target;
 use RulerZ\RulerZ;
 
 // compiler
-$compiler = new Compiler::create();
+$compiler = Compiler::create();
 
 // RulerZ engine
 $rulerz = new RulerZ(
@@ -84,4 +84,4 @@ you want to use. See the "[Custom operators](custom_operators.md)" section.
 Now that you can write rules, you can use them to [filter targets](filter.md)
 or to [check if a target satisfies them](satisfies.md).
 
-[Return to the index to explore the other possibilities of the library](index.md)
+[Return to the index to explore the other possibilities of the library](index.md)