Merge branch 'ar/modified-bases-docstring' into 'master'

docs(pileup): adds doc string for `--modified-bases`

See merge request machine-learning/modkit!312

Author: ArtRand

modkit-core/src/pileup/subcommand.rs

@@ -282,6 +282,11 @@ pub struct ModBamPileup {
         hide_short_help = true
     )]
     mask: bool,
+    /// Specify which modified bases to tablulate counts for. These can be
+    /// the "long name" such as '5mC', '6mA' (or 'm6a' for RNA), or 'Inosine'.
+    /// You can also pass <primary_base>:<mod_code>, such as 'C:m'. Finally,
+    /// when running with --combine-mods the reference base can be passed
+    /// alone, such as 'C' or 'A'.
     #[arg(
         long,
         requires = "reference_fasta",