Type annotations are denoted by a colon instead of a semicolon. (#699)

Co-authored-by: KevinEdwardBerry <kevin.berry@improving.com>

concepts/basics/about.md

@@ -79,7 +79,7 @@ let explicitConstant: Int = 10 // Explicitly typed constant
 
 Swift has [operators][arithmetical-operators] for addition, subtraction, and multiplication.
 The operators are `+`, `-`, and `*` respectively.
-  
+
 ```swift
 print(1 + 1) // Prints 2
 print(2 - 1) // Prints 1
@@ -92,7 +92,7 @@ In Swift, [functions][functions] are a chunk of code that performs a task.
 A function has a return type and can thereby be used as a value and be parsed as arguments to other functions.
 In Swift are functions defined using the `func` keyword followed by the name of the function, arguments separated by commas, and a return type.
 
-The arguments are defined by an argument label, a parameter name followed by a semi-colon and then a type.
+The arguments are defined by an argument label, a parameter name followed by a colon and then a type.
 The return type is defined by a `->` followed by the type of the return value.
 
 ```swift

concepts/basics/introduction.md

@@ -65,7 +65,7 @@ let explicitConstant: Int = 10 // Explicitly typed constant
 
 Swift has [operators][arithmetical-operators] for addition, subtraction, and multiplication.
 The operators are `+`, `-`, and `*` respectively.
-  
+
 ```swift
 print(1 + 1) // Prints 2
 print(2 - 1) // Prints 1
@@ -78,7 +78,7 @@ In Swift, [functions][functions] are a chunk of code that performs a task.
 A function has a return type and can thereby be used as a value and be parsed as arguments to other functions.
 In Swift are functions defined using the `func` keyword followed by the name of the function, arguments separated by commas, and a return type.
 
-The arguments are defined by an argument label, a parameter name followed by a semi-colon and then a type.
+The arguments are defined by an argument label, a parameter name followed by a colon and then a type.
 The return type is defined by a `->` followed by the type of the return value.
 
 ```swift