docs: Remove references to --include-related (meltano#7566)

Co-authored-by: Edgar R. M <edgar@meltano.com>

docs/src/_reference/command-line-interface.md

@@ -628,8 +628,6 @@ Installs dependencies of your project based on the **meltano.yml** file.
 Optionally, provide a plugin type argument to only (re)install plugins of a certain type.
 Additionally, plugin names can be provided to only (re)install those specific plugins.
 
-Use `--include-related` to automatically install transforms related to installed extractor plugins.
-
 Subsequent calls to `meltano install` will upgrade a plugin to its latest version, if any. To completely uninstall and reinstall a plugin, use `--clean`.
 
 Meltano installs plugins in parallel. The number of plugins to install in parallel defaults to the number of CPUs on the machine, but can be controlled with `--parallelism`. Use `--parallelism=1` to disable the feature and install them one at a time.
@@ -668,8 +666,6 @@ meltano install extractors
 meltano install extractor tap-gitlab
 meltano install extractors tap-gitlab tap-adwords
 
-meltano install --include-related
-
 meltano install --parallelism=16
 meltano install --clean