Fix broken links in markdown

These were just broken anchors.

Author: andrewnicols

docs/guides/testing/index.md

@@ -715,7 +715,7 @@ There are several ways how to inject your custom settings:
 
 These constants may be then used in your test or plugin code.
 
-## Upgrading unit tests to work with Moodle 4.4 and up (PHPUnit 9.6)
+## Upgrading unit tests to work with Moodle 4.4 and up (PHPUnit 9.6) {#upgrading-unit-tests-to-work-with-moodle-4.4}
 
 With Moodle 4.4, **PHPUnit was upgraded to 9.6** (from 9.5 being used in previous versions). This was done to **warn to developers in advance** about functionality that has been deprecated in the 9.5 series and will be removed so will stop working with the next major update to PHPUnit 10.x (see [MDL-81266](https://moodle.atlassian.net/browse/MDL-81266) and linked issues for more details).
 

general/development/policies/codingstyle/index.md

@@ -637,7 +637,7 @@ There are no rules limiting what can be used as a level 3 namespace.
 This is where a plugin or addon can make extensive use of namespaces with no
 chance of conflict with any other plugin or api, now and forever onwards.
 
-#### Namespaces within `**/tests` directories(#namespaces-within-tests)
+#### Namespaces within `**/tests` directories {#namespaces-within-tests}
 
 :::info
 

general/releases/3.11.md

@@ -215,7 +215,7 @@ For the best experience and optimum security, we recommend that you keep your br
 
 ## For developers
 
-The PHPUnit upgrade will almost certainly break your tests. See [Writing PHPUnit tests#Upgrading unit tests to work with Moodle 3.11 and up .28PHPUnit 9.5.29](/docs/guides/testing/#upgrading-unit-tests-to-work-with-moodle-3.11-and-up-.28phpunit-9.5.29)
+The PHPUnit upgrade will almost certainly break your tests.
 
 - [MDL-52817](https://moodle.atlassian.net/browse/MDL-52817) - New sql_group_concat db method
 - [MDL-64554](https://moodle.atlassian.net/browse/MDL-64554) - Add module for displaying moodleform in a modal window

general/releases/3.4.md

@@ -154,7 +154,7 @@ This list only includes security issues fixed after 3.3.2 release. Refer to othe
 
 ### For developers
 
-- [MDL-60611](https://moodle.atlassian.net/browse/MDL-60611) - Upgrade PHPUnit to 6.4 to ensure compatibility with PHP 7.2 - [may require changes in unittests](/docs/guides/testing/#upgrading-unit-tests-to-work-with-moodle-3.4-and-up-.28phpunit-6.29).
+- [MDL-60611](https://moodle.atlassian.net/browse/MDL-60611) - Upgrade PHPUnit to 6.4 to ensure compatibility with PHP 7.2 - may require changes in unittests
 - [MDL-58948](https://moodle.atlassian.net/browse/MDL-58948) - Compatibility with chrome mink driver
 - [MDL-53169](https://moodle.atlassian.net/browse/MDL-53169) - Provide a way to retrieve all courses a user can potentially access.
 - [MDL-59459](https://moodle.atlassian.net/browse/MDL-59459) - Global Search: Increase file indexing coverage

versioned_docs/version-5.1/guides/testing/index.md

@@ -715,7 +715,7 @@ There are several ways how to inject your custom settings:
 
 These constants may be then used in your test or plugin code.
 
-## Upgrading unit tests to work with Moodle 4.4 and up (PHPUnit 9.6)
+## Upgrading unit tests to work with Moodle 4.4 and up (PHPUnit 9.6) {#upgrading-unit-tests-to-work-with-moodle-4.4}
 
 With Moodle 4.4, **PHPUnit was upgraded to 9.6** (from 9.5 being used in previous versions). This was done to **warn to developers in advance** about functionality that has been deprecated in the 9.5 series and will be removed so will stop working with the next major update to PHPUnit 10.x (see [MDL-81266](https://moodle.atlassian.net/browse/MDL-81266) and linked issues for more details).