Fixes to docs.

FPLOT.md

@@ -175,7 +175,7 @@ Mandatory arguments:
 Optional arguments:  
  3. `populate=None` A generator to populate the curve. See below.   
  4. `origin=(0,0)` 2-tuple containing x and y values for the origin. Provides
- for an optional shift of the data's origin.
+ for an optional shift of the data's origin.  
  5. `excursion=(1,1)` 2-tuple containing scaling values for x and y.  
 
 Methods:

README.md

@@ -63,6 +63,8 @@ wiring details, pin names and hardware issues.
  4. [ESP8266](./README.md#4-esp8266) This can work. Contains information on
  minimising the RAM and flash footprints of the GUI.  
 
+#### [Graph plotting module.](./FPLOT.md)
+
 #### [Device driver document.](./DRIVERS.md)
 
 # 1. Introduction