docs: copyyedit docs/dev/how-to-use-direnv.md (#10002)

docs/dev/how-to-use-direnv.md

@@ -1,28 +1,29 @@
 # How to use direnv
 
-As a developer, it can be better not to think too much about setting right env variables as you enter a project.
+As a developer, it can be better not to think too much about setting the right env variables as you enter a project.
 [`direnv`](https://direnv.net/) aims at providing a solution.
 
 As a quick guide as an openfoodfacts developer:
 
-- install direnv on your system using usual package manager
+- install direnv on your system using the usual package manager
 - in your .bashrc add:
     ```bash
     # direnv
     eval "$(direnv hook bash)"
     ```
-  you have adapt the direnv line according to what you use, see [direnv doc](https://direnv.net/docs/hook.html)
-- In your project directory add a file, where you superseed variables from `.env`
-  that you wan't to
+  You have to adapt the direnv line according to what you use; see [direnv doc](https://direnv.net/docs/hook.html).
+- in your project directory add a file, where you override variables from `.env`
+  that you want to:
 
 ```
 echo "setting up docker compose env"
 export DOCKER_BUILDKIT=1
+# The next two lines do the same thing in different ways; choose one.
 export USER_UID=${UID}
 export USER_UID=$(id -g)
 ```
 
-- in project directory, run `direnv allow .`
+- in your project directory, run `direnv allow .`
 - in a new shell:
-  - go in project directory
-  - you should have direnv trigger and load your variables
+  - go to the project directory
+  - direnv should trigger and load your variables