docs(nx-dev): Remove unused environment variables (#28521)

docs/shared/reference/environment-variables.md

@@ -15,7 +15,6 @@ The following environment variables are ones that you can set to change the beha
 | NX_PERF_LOGGING                | boolean | If set to `true`, will print debug information useful for for profiling executors and Nx itself                                                                                                                                                                                                               |
 | NX_PROFILE                     | string  | Prepend `NX_PROFILE=profile.json` before running targets with Nx to generate a file that be [loaded in Chrome dev tools](/troubleshooting/performance-profiling) to visualize the performance of Nx across multiple processes.                                                                                |
 | NX_WORKSPACE_DATA_DIRECTORY    | string  | The project graph cache and some other internal nx caches are stored in `.nx/workspace-data` by default. Set this variable to use a different directory.                                                                                                                                                      |
-| NX_PROJECT_GRAPH_MAX_WORKERS   | number  | The number of workers to use when calculating the project graph.                                                                                                                                                                                                                                              |
 | NX_PARALLEL                    | number  | The number of tasks Nx should run in parallel. Overrides any configured value inside nx.json                                                                                                                                                                                                                  |
 | NX_RUNNER                      | string  | The name of task runner from the config to use. Can be overridden on the command line with `--runner`. Not read if `NX_TASKS_RUNNER` is set.                                                                                                                                                                  |
 | NX_SKIP_NX_CACHE               | boolean | Rerun the tasks even when the results are available in the cache                                                                                                                                                                                                                                              |
@@ -33,7 +32,6 @@ The following environment variables are ones that you can set to change the beha
 | NX_LOAD_DOT_ENV_FILES          | boolean | If set to 'false', Nx will not load any environment files (e.g. `.local.env`, `.env.local`)                                                                                                                                                                                                                   |
 | NX_NATIVE_FILE_CACHE_DIRECTORY | string  | The cache for native `.node` files is stored under a global temp directory by default. Set this variable to use a different directory. This is interpreted as an absolute path.                                                                                                                               |
 | NX_PLUGIN_NO_TIMEOUTS          | boolean | If set to `true`, plugin operations will not timeout                                                                                                                                                                                                                                                          |
-| NX_SOCKET_DIRECTORY            | string  | Sets the directory that Nx will use when creating sockets to communicate with child processes. May be needed if the derived socket path is too long.                                                                                                                                                          |
 
 Nx will set the following environment variables so they can be accessible within the process even outside of executors and generators.