fix(curriculum): use lower case int in Code-related Concepts and Terms (freeCodeCamp#60695)

Author: Supravisor

curriculum/challenges/english/21-a2-english-for-developers/learn-how-to-use-code-related-concepts-and-terms/6630e965a9e9c46e8b5a3ee2.md

@@ -29,15 +29,15 @@ Decimal numbers
 
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-`Int` is used for whole numbers, not for numbers with decimal parts.
+`int` is used for whole numbers, not for numbers with decimal parts.
 
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 Textual information
 
 ### --feedback--
 
-`Int` represents whole numbers, not text. `String` is used for textual information.
+`int` represents whole numbers, not text.
 
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@@ -49,7 +49,7 @@ Images or graphics
 
 ### --feedback--
 
-`Int` is for storing numerical values, not for images or graphics.
+`int` is for storing numerical values, not for images or graphics.
 
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