fix: typo in environment-variables.md (#29294)

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Fixes #

docs/shared/reference/environment-variables.md

@@ -12,7 +12,7 @@ The following environment variables are ones that you can set to change the beha
 | NX_DAEMON                      | boolean | If set to `false`, disables the Nx daemon process. Disable the daemon to print `console.log` statements in plugin code you are developing.                                                                                                                                                                    |
 | NX_DEFAULT_PROJECT             | string  | The default project used for commands which require a project. e.g. `nx build`, `nx g component`, etc.                                                                                                                                                                                                        |
 | NX_HEAD                        | string  | The default head branch to use when calculating the affected projects. Can be overridden on the command line with `--head`.                                                                                                                                                                                   |
-| NX_PERF_LOGGING                | boolean | If set to `true`, will print debug information useful for for profiling executors and Nx itself                                                                                                                                                                                                               |
+| NX_PERF_LOGGING                | boolean | If set to `true`, will print debug information useful 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_PARALLEL                    | number  | The number of tasks Nx should run in parallel. Overrides any configured value inside nx.json                                                                                                                                                                                                                  |