Improved description of HIGH constant.

This fixes #470

Author: robsoncouto

Language/Variables/Constants/constants.adoc

@@ -4,10 +4,6 @@ categories: [ "Variables" ]
 subCategories: [ "Constants" ]
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 = Constants
 
 
@@ -48,7 +44,7 @@ The meaning of `HIGH` (in reference to a pin) is somewhat different depending on
   - a voltage greater than 2.0V volts is present at the pin (3.3V boards)
 [%hardbreaks]
 
-A pin may also be configured as an INPUT with `pinMode()`, and subsequently made HIGH with link:../../../functions/digital-io/digitalwrite[digitalWrite()]. This will enable the internal 20K pullup resistors, which will _pull up_ the input pin to a `HIGH` reading unless it is pulled `LOW` by external circuitry. This is how `INPUT_PULLUP` works and is described below in more detail.
+A pin may also be configured as an INPUT with `pinMode()`, and subsequently made HIGH with link:../../../functions/digital-io/digitalwrite[digitalWrite()]. This will enable the internal 20K pullup resistors, which will _pull up_ the input pin to a `HIGH` reading unless it is pulled `LOW` by external circuitry. This can done alternatively by passing `INPUT_PULLUP` as argument to the `pinMode()` funtion, as explained in more detail in the section "Defining Digital Pins modes: INPUT, INPUT_PULLUP, and OUTPUT" further below.
 [%hardbreaks]
 
 When a pin is configured to OUTPUT with `pinMode()`, and set to `HIGH` with `digitalWrite()`, the pin is at: