fix(curriculum): fixed typo in CSS Pseudo-classes Review (freeCodeCamp#64310)

Author: bdtripp

curriculum/challenges/english/blocks/review-css-pseudo-classes/671a907bad4538752765f2ff.md

@@ -26,7 +26,7 @@ dashedName: review-css-pseudo-classes
 - **`:invalid` Pseudo-class**: This pseudo-class targets the input fields that do not meet the validation criteria.
 - **`:in-range` and `:out-of-range` Pseudo-classes**: These pseudo-classes apply styles to elements based on whether their values are within or outside specified range constraints.
 - **`:required` Pseudo-class**: This pseudo-class targets `input` elements that have the `required` attribute. It signals to the user that they must fill out the field to submit the form.
-- **`:optional` Pseudo-class**: This pseudo-class applies styles input elements that are not required and can be left empty.
+- **`:optional` Pseudo-class**: This pseudo-class applies styles to input elements that are not required and can be left empty.
 - **`:autofill` Pseudo-class**: This pseudo-class applies styles to input fields that the browser automatically fills with saved data.
 
 ## Location Pseudo-classes

curriculum/challenges/english/blocks/review-css/671a9a0a140c2b9d6a75629f.md

@@ -153,7 +153,7 @@ Review the concepts below to prepare for the upcoming exam.
 - **`:invalid` Pseudo-class**: This pseudo-class targets the input fields that do not meet the validation criteria.
 - **`:in-range` and `:out-of-range` Pseudo-classes**: These pseudo-classes applies styles to elements based on whether their values are within or outside specified range constraints.
 - **`:required` Pseudo-class**: This pseudo-class targets `input` elements that have the `required` attribute. It signals to the user that they must fill out the field to submit the form.
-- **`:optional` Pseudo-class**: This pseudo-class applies styles input elements that are not required and can be left empty.
+- **`:optional` Pseudo-class**: This pseudo-class applies styles to input elements that are not required and can be left empty.
 - **`:autofill` Pseudo-class**: This pseudo-class applies styles to input fields that the browser automatically fills with saved data.
 
 ## Location Pseudo-classes