doc: Fix some broken links to commit/blob URLs

A few of the links discovered to have been broken while updating
them are easy to fix. This fixes those.

They were broken due to changes in the repository structure or
contents that were not fully reflected when the links were last
updated. For example, when `git-*` crates were renamed to their
current `gix-*` names, URLs were updated, but some of these were
GitHub URLs where the commit hash was for a commit prior to the
rename.

Author: EliahKagan

general-tasks.md

@@ -8,7 +8,7 @@ don't support that as we would have to keep both the future and the parent that
 pointers, one could implement the magical part by hand, a custom future, which happily dissolves into its mutable parent iter ref.
 That would be quite some work though.
 
-[WithSidebands]: https://github.com/GitoxideLabs/gitoxide/blob/fed6c69fd8b2877a66fe9d87916f3d54a3fc342b/gix-packetline/src/read/sidebands/async_io.rs#L197
+[WithSidebands]: https://github.com/GitoxideLabs/gitoxide/blob/64872690e60efdd9267d517f4d9971eecd3b875c/gix-packetline/src/read/sidebands/async_io.rs#L270
 
 ## Potential for improving performance
 

gix-quote/src/ansi_c.rs

@@ -34,7 +34,7 @@ use bstr::{BStr, BString, ByteSlice};
 ///
 /// See [the tests][tests] for quotation examples.
 ///
-/// [tests]: https://github.com/GitoxideLabs/gitoxide/blob/e355b4ad133075152312816816af5ce72cf79cff/gix-odb/src/alternate/unquote.rs#L110-L118
+/// [tests]: https://github.com/GitoxideLabs/gitoxide/blob/64872690e60efdd9267d517f4d9971eecd3b875c/gix-quote/tests/quote.rs#L57-L74
 pub fn undo(input: &BStr) -> Result<(Cow<'_, BStr>, usize), undo::Error> {
     if !input.starts_with(b"\"") {
         return Ok((input.into(), input.len()));

gix-ref/src/parse.rs

@@ -5,7 +5,7 @@ fn is_hex_digit_lc(b: u8) -> bool {
     matches!(b, b'0'..=b'9' | b'a'..=b'f')
 }
 
-/// Copy from https://github.com/GitoxideLabs/gitoxide/blob/f270850ff92eab15258023b8e59346ec200303bd/gix-object/src/immutable/parse.rs#L64
+/// Copy from https://github.com/GitoxideLabs/gitoxide/blob/64872690e60efdd9267d517f4d9971eecd3b875c/gix-object/src/parse.rs#L60-L67
 pub fn hex_hash<'a, E: ParserError<&'a [u8]>>(i: &mut &'a [u8]) -> PResult<&'a BStr, E> {
     // NOTE: It's important to be able to read all hashes, do not parameterize it. Hashes can be rejected at a later stage
     // if needed.