Add URLs for Stack 2.9.3 in documentation.

Author: mpilgrem

doc/build_command.md

@@ -358,7 +358,7 @@ project packages or from local dependencies). See also the `--file-watch` flag.
 
 ### The `stack build --tests-allow-stdin` flag
 
-:octicons-tag-24: 2.9.3
+[:octicons-tag-24: 2.9.3](https://github.com/commercialhaskell/stack/releases/tag/v2.9.3)
 
 Default: Enabled
 

doc/config_command.md

@@ -63,7 +63,7 @@ user-specific global configuration file (`config.yaml`).
 
 ## The `stack config set package-index download-prefix` command
 
-:octicons-tag-24: 2.9.3
+[:octicons-tag-24: 2.9.3](https://github.com/commercialhaskell/stack/releases/tag/v2.9.3)
 
 ~~~text
 stack config set package-index download-prefix [--global] [URL]

doc/yaml_configuration.md

@@ -369,7 +369,7 @@ allow-newer: true
 
 ### allow-newer-deps (experimental)
 
-:octicons-tag-24: 2.9.3
+[:octicons-tag-24: 2.9.3](https://github.com/commercialhaskell/stack/releases/tag/v2.9.3)
 
 Default: `none`
 
@@ -979,7 +979,7 @@ For further information, see the
 
 ### package-index
 
-:octicons-tag-24: 2.9.3
+[:octicons-tag-24: 2.9.3](https://github.com/commercialhaskell/stack/releases/tag/v2.9.3)
 
 Default: