Apply suggestions from code review

Co-authored-by: ocaisa <alan.ocais@cecam.org>

docs/using_eessi/building_on_eessi.md

@@ -20,8 +20,8 @@ module help EESSI-extend/2023.06-easybuild
 ```
 
 The installation prefix is determined by `EESSI-extend` through the following logic:
-1. If `EESSI_CVMFS_INSTALL` is set, software inst installed in `EESSI_SOFTWARE_PATH`. This variable shouldn't be used by users and would only be used by CVMFS administrators of the EESSI repository.
-2. If `EESSI_SITE_INSTALL` is set (and this is set by default when the EESSI environment is initialized) and the EESSI site installation prefix (`/cvmfs/software.eessi.io/host_injections/...`) is writeable, this prefix will be used. This is typically where sites hosting a system that has EESSI deployed would install additional software on top of EESSI and make it available to all their users.
+1. If `EESSI_CVMFS_INSTALL` is set, software is installed in `EESSI_SOFTWARE_PATH`. This variable shouldn't be used by users and would only be used by CVMFS administrators of the EESSI repository.
+2. If `EESSI_SITE_INSTALL` is set and the EESSI site installation prefix (`/cvmfs/software.eessi.io/host_injections/...`) is writeable, this prefix will be used. This is typically where sites hosting a system that has EESSI deployed would install additional software on top of EESSI and make it available to all their users.
 3. If `EESSI_PROJECT_INSTALL` is set (and `EESSI_USER_INSTALL` is not set), this prefix will be used. You should use this if you want to install additional software on top of EESSI that should also be usable by your project partners on the same system.
 4. If `EESSI_USER_INSTALL` is set, this prefix will be used. You should use this if yo uwant to install additional software on top of EESSI just for your own user.
 If none of the above apply, the default is a user installation in `$HOME/EESSI` (i.e. effectively the same as setting `EESSI_USER_INSTALL=$HOME/EESSI`).