Fixed indents

Author: C-Stevens

doc/inheritance-extension.md

@@ -6,17 +6,17 @@
 Classes are extended by use of the `extends` keyword.
 ```php
 <?php
-	class myClass {
-    	private $foo;
+    class myClass {
+        private $foo;
         public function setFoo($value) {
-        	$this->foo = $value;
+            $this->foo = $value;
         }
     }
-    
+
     class myOtherClass extends myClass {
-    	public $bar;
+        public $bar;
         public function baz() {
-        	print "This is a unique method that myClass doesn't have";
+            print "This is a unique method that myClass doesn't have";
         }
     }
 ?>
@@ -25,12 +25,12 @@ Classes are extended by use of the `extends` keyword.
 Classes are inherited as they are defined:
 ```python
 class myClass:
-	foo = 1
+    foo = 1
     def setFoo(value):
-    	self.foo = value
+        self.foo = value
 
 class myOtherClass(myClass):
-	bar = "apples"
+    bar = "apples"
     def baz():
-    	print "This method is unique to myOtherClass and isn't in myClass"
+        print "This method is unique to myOtherClass and isn't in myClass"
 ```