[ docs ] Fix readthedocs links in packages.rst

The links for "pack collection" and "third-party libraries" were missing
a space between the display text and the ref, leading to incorrect
hyperlinks in the readthedocs output.

Author: CodingCellist

docs/source/tutorial/packages.rst

@@ -37,8 +37,10 @@ package file would be:
 Running ``idris2 --init`` will interactively create a new package file in the current directory. The generated package file lists all configurable fields with a brief description.
 
 Other examples of package files can be found in the ``libs`` directory
-of the main Idris repository, in the `pack collection<https://github.com/stefan-hoeck/idris2-pack-db/blob/main/collections/HEAD.toml>`_
-, and in `third-party libraries<https://github.com/idris-lang/Idris2/wiki/Third-party-Libraries>`_.
+of the main Idris repository, in the
+`pack collection <https://github.com/stefan-hoeck/idris2-pack-db/blob/main/collections/HEAD.toml>`_,
+and in
+`third-party libraries <https://github.com/idris-lang/Idris2/wiki/Third-party-Libraries>`_.
 
 
 Using Package files