`switch_to_lowercase`

Changes all selected letters to lowercase.

--- Examples ---

┌──────────────────────────────────┐     ┌──────────────────────────────────┐
│ This (wOrD] should be lowercase. │ --> │ This (word] should be lowercase. │
└──────────────────────────────────┘     └──────────────────────────────────┘