Fix a couple of links in the documentation

PGUnit seems to have dissappeared, and the GitHub link doesn't need or
want the `/tree`. Resolves #333.

Changes

@@ -6,6 +6,9 @@ Revision history for pgTAP
 
 * Fix bug introduced in v1.3.2 where `col_type_is` throws an error when the
   type isn't in the search path. Thanks to Erik Wienhold for the PR (#332)!
+* Removed the reference to PGUnit from the docs, as the project seems to have
+  disappeared. Also the link to the GitHub repo. Thanks to Vick Khera for the
+  report (#333)!
 
 1.3.2 2024-02-04T18:59:37Z
 --------------------------

doc/pgtap.mmd

@@ -382,8 +382,7 @@ What a sweet unit!
 ------------------
 
 If you're used to xUnit testing frameworks, you can collect all of your tests
-into database functions and run them all at once with `runtests()`. This is
-similar to how [PGUnit](http://en.dklab.ru/lib/dklab_pgunit/) works. The
+into database functions and run them all at once with `runtests()`. The
 `runtests()` function does all the work of finding and running your test
 functions in individual transactions. It even supports setup and teardown
 functions. To use it, write your unit test functions so that they return a set
@@ -8779,15 +8778,15 @@ Public Repository
 -----------------
 
 The source code for pgTAP is available on
-[GitHub](https://github.com/theory/pgtap/tree/). Please feel free to fork and
+[GitHub](https://github.com/theory/pgtap/). Please feel free to fork and
 contribute!
 
 Mail List
 ---------
 
-Join the pgTAP community by subscribing to the [pgtap-users mail
-list](https://groups.google.com/forum/#!forum/pgtap-users). All questions,
-comments, suggestions, and bug reports are welcomed there.
+Join the pgTAP community by subscribing to the
+[pgtap-users mail list](https://groups.google.com/forum/#!forum/pgtap-users).
+All questions, comments, suggestions, and bug reports are welcomed there.
 
 Author
 ------