Fixup typos etc in PHP Promotion problem file

Author: mikeymike

exercises/php-gets-a-promotion/problem/problem.md

@@ -1,16 +1,16 @@
-You have been given a piece of code (look for `php-gets-a-promotionn.php` in your working directory) which provides a class written for PHP 7.
-The code itself works well assigning constructor arguments to the class properties. Your job is to write the code in a more terse format, by using the newly introduced
+You have been given a piece of code (look for `php-gets-a-promotion.php` in your working directory) which provides a class written for PHP 7.
+The code itself works well, assigning constructor arguments to the class properties. Your job is to write the code in a more terse format, by using the newly introduced
 constructor property promotion in PHP 8.
 
-The code is a class is one that would hypothetically be used to call a provided `\Closure` when reading a row of a CSV, passing in the appropriate cell value, but the implementation logic is not important and thus left out.
+The code is a class that would hypothetically be used to call a provided `\Closure` when reading a row of a CSV, passing in the appropriate cell value, but the implementation logic is not important and thus left out.
 
-Focus on converting the constructor to a terse format using constructor propery promotion.
+Focus on converting the constructor to a terse format using constructor property promotion.
 
 ### The advantages of constructor property promotion
 
 * Less boilerplate code is required when writing a class
-* Still provides the required information for static analysis / runtime type parsing
-* Is compatible in conjuction with properties that cannot be promoted
+* It still provides the required information for static analysis / runtime type parsing
+* Is compatible in conjunction with properties that cannot be promoted
 
 
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@@ -21,13 +21,7 @@ Documentation on the constructor property promotion feature can be found by poin
 
 Remember to keep the same visibility for the properties
 
-You will be expected to make use of the constructor propery promotion feature
+You will be expected to make use of the constructor property promotion feature
 
 You should have less code than the provided initial code
 
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-## EXTRA
-
-?? ALways fun to have something, but what...