Fix links to obsolete pages

Author: sarjona

docs/apis/plugintypes/atto/index.md

@@ -5,7 +5,7 @@ tags: []
 
 <Since versions={["2.7"]} issueNumber="MDL-43841" />
 
-Atto is a JavaScript text editor built specifically for Moodle. It is the default text editor in Moodle from 2.7 onwards, and is implemented as a standard Moodle [text editor plugin](https://docs.moodle.org/dev/Editors). Most of the code is written in JavaScript using YUI modules.
+Atto is a JavaScript text editor built specifically for Moodle. It is the default text editor in Moodle from 2.7 onwards, and is implemented as a standard Moodle [text editor plugin](./../../subsystems/editor/index.md). Most of the code is written in JavaScript using YUI modules.
 
 All of the buttons in Atto are implemented as Moodle subplugins. This means that the subplugins can do anything a subplugin can do including, using language strings, database tables, other JavaScript, and more.
 

docs/apis/plugintypes/index.md

@@ -74,7 +74,7 @@ The underscore character is not supported in activity modules for legacy reasons
 | [Question behaviours](https://docs.moodle.org/dev/Question_behaviours) | qbehaviour | /question/behaviour | Control how student interact with questions during an attempt | 2.1+ |
 | [Question import/export formats](https://docs.moodle.org/dev/Question_formats) | qformat | /question/format | Import and export question definitions to/from the question bank | 1.6+ |
 | [Text filters](./filter/index.md) | filter | /filter | Automatically convert, highlight, and transmogrify text posted into Moodle. | 1.4+ |
-| [Editors](https://docs.moodle.org/dev/Editors) | editor | /lib/editor | Alternative text editors for editing content | 2.0+ |
+| [Editors](./../subsystems/editor/index.md) | editor | /lib/editor | Alternative text editors for editing content | 2.0+ |
 | [Atto editor plugins](./atto/index.md) | atto | /lib/editor/atto/plugins | Extra functionality for the Atto text editor | 2.7+ |
 | [Enrolment plugins](./enrol/index.md) | enrol | /enrol | Ways to control who is enrolled in courses | 2.0+ |
 | [Authentication plugins](https://docs.moodle.org/dev/Authentication_plugins) | auth | /auth | Allows connection to external sources of authentication | 2.0+ |

general/releases/2.0.md

@@ -51,7 +51,7 @@ Moodle 2.0 contains a lot of large new features, some completely rewritten featu
 - These can be chained together to enable progressive disclosure of the course content, if that is desired.
 - Teachers can now specify conditions that define when any **activity** is seen as [completed](https://docs.moodle.org/en/Activity_completion) by a student.  For example, when a certain number of posts have been made, or a grade has been reached, or a choice has been made.
 
-#### [Cohorts](https://docs.moodle.org/dev/Cohorts)
+#### Cohorts
 
 - Also known as "Site-wide groups", these are site-wide collections of users that can be enrolled into courses in one action, either manually or synchronised automatically