What does this implement/fix?

All max7219digit actions were registered with the name max7129digit (transposed digits 1 and 2) instead of max7219digit, making the actions impossible to use with the correct component name. For example, max7219digit.reverse_on would fail with "Unable to find action", and only the mistyped max7129digit.reverse_on would work.

This is a breaking change for anyone who discovered and used the typo'd action names, but since the documented names never worked, this is effectively a bugfix.

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Developer breaking change (an API change that could break external components)
• Code quality improvements to existing code or addition of tests
• Other

Related issue or feature (if applicable):

• fixes max7219 inverting action doesn't work #14154

Pull request in esphome-docs with documentation (if applicable):

• [max7219digit] Fix incorrect action names in documentation esphome-docs#6131

Test Environment

• ESP32
• ESP32 IDF
• ESP8266
• RP2040
• BK72xx
• RTL87xx
• LN882x
• nRF52840

Example entry for config.yaml:

display:
  - platform: max7219digit
    cs_pin: GPIO15
    num_chips: 4
    id: my_matrix
    lambda: |-
      it.print(0, 0, id(font1), "Hello");

binary_sensor:
  - platform: gpio
    pin: GPIO16
    on_press:
      then:
        - max7219digit.reverse_on:
    on_release:
      then:
        - max7219digit.reverse_off:

Checklist:

• The code change is tested and works locally.
• Tests have been added to verify that the new code works (under tests/ folder).

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated in esphome-docs.