fix(usage): clarify fallback behavior and update shell configuration instructions

usage.md

@@ -80,7 +80,7 @@ See [taskfile.build/image](/image) for details.
 
 ## Default
 
-Instead of setting up a task file for every ptoject, you can also set up one and fallback to the local task file.
+Instead of setting up a task file for every ptoject, you can also set up only one with a fallback to the task file in the `$PWD`.
 
 First create symlink from your shell bin folder to the template task file. It is recommended to use the `$HOME/.local/bin/` folder.
 
@@ -90,7 +90,7 @@ Create the symlink:
 ln -sf "$HOME/taskfile.build/task.template" "$HOME/.local/bin/task"
 ```
 
-For your shell set this config:
+Add this config to your shell profile:
 
 ```bash
 export PATH="$HOME/.local/bin:$PATH"
@@ -104,7 +104,7 @@ task() {
 }
 ```
 
-Remove the at the beginning of this document recommended alias.
+Remove the `alias task='./task'` alias from your profile. It is no longer necessary.
 
 ## Integration
 
@@ -171,5 +171,5 @@ pipeline {
             }
         }
     }
-}%
+}
 ```