[skip changelog] Add links to additional information in the examples section of the library specification (#804)

* Move examples style guide link to examples section of the library specification

* Add sketch specification link to examples section of the library specification

Author: per1234

docs/library-specification.md

@@ -15,8 +15,6 @@ Arduino development software supports multiple microcontroller architectures (e.
 
 The Arduino library style guide is here : http://arduino.cc/en/Reference/APIStyleGuide
 
-The style guide for examples is here : http://arduino.cc/en/Reference/StyleGuide
-
 ## 1.5 library format (rev. 2.2)
 
 ### Library metadata
@@ -102,6 +100,11 @@ Library examples must be placed in the **examples** folder. Note that the **exam
 
 Sketches contained inside the examples folder will be shown in the Examples menu of the Arduino IDE and Arduino Web Editor.
 
+More information:
+
+* [Arduino sketch specification](sketch-specification.md)
+* [Style guide for Arduino examples](http://arduino.cc/en/Reference/StyleGuide)
+
 #### Extra documentation
 
 An **extras** folder can be used by the developer to put documentation or other items to be bundled with the library. Remember that files placed inside this folder will increase the size of the library, so putting a 20MB PDF in a library that weights a few kilobytes may not be such a good idea.