docs: fix filePath in readme

Co-authored-by: TylerGood-numerated

Author: thollander

README.md

@@ -29,9 +29,9 @@ jobs:
 
 ### Comment a file content
 
-Thanks to the `filePath` input, a file content can be commented.
-You can either pass an absolute filePath or a relative one that will be by default retrieved from `GITHUB_WORKSPACE`. 
-(Note that if both a `message` and `filePath` are provided, `message` will take precedence.)
+Thanks to the `file-path` input, a file content can be commented.
+You can either pass an absolute file-path or a relative one that will be by default retrieved from `GITHUB_WORKSPACE`. 
+(Note that if both a `message` and `file-path` are provided, `message` will take precedence.)
 
 ```yml
 - name: PR comment with file