[docs] Correct direnv.md reference to devbox generate direnv (#1042)

## Summary

Docs update. Docs refer to `devbox generate envrc` when it should be
`devbox generate direnv`

## How was it tested?

Visually? 🤷

Signed-off-by: Chance Carey <[email protected]>

Author: chancecarey

docs/app/docs/ide_configuration/direnv.md

@@ -34,7 +34,7 @@ or `direnv revoke` to stop.
 
 #### Existing Project
 
-For an existing project, you can add a `.envrc` file by running `devbox generate envrc`:
+For an existing project, you can add a `.envrc` file by running `devbox generate direnv`:
 
 ```bash
 ➜  devbox generate direnv
@@ -55,4 +55,4 @@ prefix = [ "/absolute/path/to/project" ]
 ```
 <!-- TODO: add steps for vscode integration -->
 
-If this guide is missing something, feel free to contribute by opening a [pull request](https://github.com/jetpack-io/devbox/pulls) in Github.
+If this guide is missing something, feel free to contribute by opening a [pull request](https://github.com/jetpack-io/devbox/pulls) in Github.