Update PinLayout_principles.md

Author: lucdion

docs/PinLayout_principles.md

@@ -6,7 +6,7 @@
 
 * Manual layouting (doesn't rely on auto layout).
 
-* PinLayout exist to be simple and fast as possible! In fact, it is fast as manual layouting. See [performance results below.](#performance)
+* PinLayout exist to be simple and fast as possible! In fact, it is fast as manual layouting. See [performance results below.](https://github.com/layoutBox/PinLayout#pinlayouts-performance)
 
 * Full control: You're in the middle of the layout process, no magic black box. 
 	* You can add conditions (if/switch/guard/...) related to the device orientation, device type, traitCollection, animations, ...
@@ -31,4 +31,4 @@ Each view can use the layout system that better suit it  (PinLayout, autolayout,
 * Not too intrusive. PinLayout only adds three properties to existing iOS classes: `UIView.pin`, `UIView.anchor` and `UIView.edge`	
 * Minimize as much as possible calculations and constants when layouting views. But it is always possible to add advanced computation if required.
 
-* Method's name match as much as possible other layout frameworks, including [FlexLayout](https://github.com/layoutBox/FlexLayout)/flexbox, CSS, React Native, …
+* Method's name match as much as possible other layout frameworks, including [FlexLayout](https://github.com/layoutBox/FlexLayout)/flexbox, CSS, React Native, …