Add more doc comments

src/app.rs

@@ -165,6 +165,7 @@ fn on_type_list() {
     }
 }
 
+/// Main entry point
 pub fn run() -> Result<()> {
     // PATTERN and REPLACEMENT are always required, except
     // when --type-list is used

src/console.rs

@@ -3,6 +3,7 @@ use colored::*;
 use crate::{replacer::Fragment, Replacement};
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
+/// Control how much information ruplacer prints to standard output
 pub enum Verbosity {
     Quiet,
     #[default]