Replace 2 datasheet-only links with SparkFun links

Author: marcelstoer

docs/en/modules/hmc5883l.md

@@ -4,7 +4,7 @@
 | 2016-04-09 | [Jason Schmidlapp](https://github.com/jschmidlapp) | [Jason Schmidlapp](https://github.com/jschmidlapp) | [hmc5883l.c](../../../app/modules/hmc5883l.c)|
 
 
-This module provides access to the [HMC5883L](https://www.adafruit.com/datasheets/HMC5883L_3-Axis_Digital_Compass_IC.pdf) three axis digital compass.
+This module provides access to the [HMC5883L](https://www.sparkfun.com/products/10530) three axis digital compass.
 
 ## hmc5883l.read()
 Samples the sensor and returns X,Y and Z data.

docs/en/modules/l3g4200d.md

@@ -4,7 +4,7 @@
 | 2015-04-09 | [Jason Schmidlapp](https://github.com/jschmidlapp) | [Jason Schmidlapp](https://github.com/jschmidlapp) | [l3g4200d.c](../../../app/modules/l3g4200d.c)|
 
 
-This module provides access to the [L3G4200D](http://www.st.com/web/en/resource/technical/document/datasheet/CD00265057.pdf) three axis digital gyroscope.
+This module provides access to the [L3G4200D](https://www.sparkfun.com/products/10612) three axis digital gyroscope.
 
 ## l3g4200d.read()
 Samples the sensor and returns the gyroscope output.