docs: use Composer brand name where possible

Signed-off-by: Maximilian Bösing <[email protected]>

Author: boesing

README.md

@@ -111,8 +111,8 @@ The "job" element will have the following elements, but is not restricted to the
   ],
   "dependencies": "(optional) dependencies to test against; one of lowest, locked, latest. default: locked",
   "command": "(required) command to run to perform the check", 
-  "ignore_platform_reqs_8": "(optional; deprecated) boolean; whether to add `--ignore-platform-req=php` to composer for PHP 8.0. default: true",
-  "ignore_php_platform_requirement": "(optional) boolean; whether to add `--ignore-platform-req=php` to composer for this job.",
+  "ignore_platform_reqs_8": "(optional; deprecated) boolean; whether to add `--ignore-platform-req=php` to Composer for PHP 8.0. default: true",
+  "ignore_php_platform_requirement": "(optional) boolean; whether to add `--ignore-platform-req=php` to Composer for this job.",
   "additional_composer_arguments": [
       "(optional) list of arguments to be passed to `composer install` and `composer update`"
   ]
@@ -225,7 +225,7 @@ If you want to limit the exclusion to specific PHP versions, you can additionall
 }
 ```
 
-In case you only want to exclude jobs for specific composer dependency sets, add `dependencies` to the `exclude` configuration:
+In case you only want to exclude jobs for specific Composer dependency sets, add `dependencies` to the `exclude` configuration:
 
 ```json
 {