More docs improvements

Author: rpavlik

docs/examples.rst

@@ -11,6 +11,8 @@ LUT Usage Example
 -----------------
 
 Use the temperature to fan speed Look Up Table to automatically control the fan speed.
+This example requires more memory than the first one because it needs to use the extended
+:class:`adafruit_emc2101.emc2101_lut.EMC2101_LUT` driver to access LUT functionality.
 
 .. literalinclude:: ../examples/emc2101_lut_example.py
     :caption: examples/emc2101_lut_example.py
@@ -21,6 +23,8 @@ PWM Tuning
 -----------------
 
 Adjust the EMC2101s PWM settings to fit your application.
+This example requires more memory than the first one because it needs to use the extended
+:class:`adafruit_emc2101.emc2101_lut.EMC2101_LUT` driver to access LUT functionality.
 
 .. literalinclude:: ../examples/set_pwm_freq.py
     :caption: examples/set_pwm_freq.py