fix(curriculum): correct typos in semantic HTML content (freeCodeCamp#61004)

Co-authored-by: Hassan Waqar <[email protected]>

Author: hassanwaqa

curriculum/challenges/english/25-front-end-development/lecture-importance-of-semantic-html/672995ffdfd2f337f5f215f8.md

@@ -46,7 +46,7 @@ Here is an example of using the subscript element to show the chemical represent
 
 The number two is wrapped inside `sub` tags to illustrate that the character should be a subscript.
 
-Common uses cases for the subscript element include chemical formulas, foot notes, and variable subscripts.
+Common use cases for the subscript element include chemical formulas, footnotes, and variable subscripts.
 
 # --questions--
 

curriculum/challenges/english/25-front-end-development/quiz-semantic-html/66ed903cf45ce3ece4053ebe.md

@@ -845,7 +845,7 @@ variable subscripts
 
 ---
 
-foot notes
+footnotes
 
 ---
 
@@ -897,7 +897,7 @@ ordinal numbers
 
 #### --answer--
 
-foot notes
+footnotes
 
 ### --question--
 

curriculum/challenges/english/25-front-end-development/review-semantic-html/671a83934b61f64cefe87a61.md

@@ -125,7 +125,7 @@ The `lang` attribute inside the open `i` tag is used to specify the language of
 </p>
 ```
 
-- **Subscript (`sub`) element**: used to represent subscript text. Common uses cases for the subscript element include chemical formulas, foot notes, and variable subscripts.
+- **Subscript (`sub`) element**: used to represent subscript text. Common use cases for the subscript element include chemical formulas, footnotes, and variable subscripts.
 
 ```html
 <p>