Clarify ATSAMR34 power circuits

Problem environment

Power circuits including decapsulation capacitors deserve clarity, in order to avoid mistakes in subsequent layout.

Steps to reproduce

1. Observe datasheet recommendations
2. Observe schematic power design
3. Determine the level of clarity

Expected result

Schematic capture leads to a clear indication of power circuits.

Actual result

Power circuits are poorly organised and lack clarity.

Workaround

Rewrite nested blocks in the decapsulation hierarchy without a complete symbol edition.

Severity level

This is low priority because project requirements do not state clarity levels or easy of reading.

Symbols and schematic capture power circuits are clarified in 37dbf8f109.