keyboardBegin.adoc: add pt_PT and hu_HU keyboard layouts

Version 1.0.5 of the Keyboard library added the Portuguese and the
Hungarian keyboard layouts. Update the documentation of Keyboard.begin()
accordingly.

Co-authored-by: Karl Söderby <[email protected]>

Author: edgar-bonet

Language/Functions/USB/Keyboard/keyboardBegin.adoc

@@ -38,7 +38,9 @@ Currently, the library supports the following national keyboard layouts:
 * `KeyboardLayout_en_US`: USA
 * `KeyboardLayout_es_ES`: Spain
 * `KeyboardLayout_fr_FR`: France
+* `KeyboardLayout_hu_HU`: Hungary
 * `KeyboardLayout_it_IT`: Italy
+* `KeyboardLayout_pt_PT`: Portugal
 * `KeyboardLayout_sv_SE`: Sweden