typo fixes all over the place

found and semi-manually replaced by using:
 codespell -L mut -L crate -i 3 -w

Mostly in comments, but also email notification and two occurrences
of misspelled  'reserved' struct member, which where not used and
cargo build did not complain about the change, soo ...

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>

src/bin/proxmox-backup-manager.rs

@@ -330,7 +330,7 @@ async fn get_versions(verbose: bool, param: Value) -> Result<Value, Error> {
 
     let options = default_table_format_options()
         .disable_sort()
-        .noborder(true) // just not helpfull for version info which gets copy pasted often
+        .noborder(true) // just not helpful for version info which gets copy pasted often
         .column(ColumnConfig::new("Package"))
         .column(ColumnConfig::new("Version"))
         .column(ColumnConfig::new("ExtraInfo").header("Extra Info"))