fix(docs): correct code examples and language name typo

- control-flow.md: fix "In Rain" → "In Radon"
- data-types.md: add missing `var` declarations in array examples
- loops.md: add missing `var` on loop counter in while_break example
- classes.md: add missing `const` on Person instantiation example
- arrays.md: add missing `const` on Array stdlib usage example

All bare assignments (x = ...) have been updated to use the proper
`var`/`const` declaration keyword so examples match idiomatic Radon.

Author: Almas-Ali

docs/arrays.md

@@ -74,7 +74,7 @@ print(arr1 * 2) # [1, 2, 3, 1, 2, 3]
 import array # Include the array standard library
 
 # Create an array instance using the Array class
-arr = array.Array([1, 2, 3, 4, 5])
+const arr = array.Array([1, 2, 3, 4, 5])
 
 print(len(arr)) # 5
 print(arr.is_empty()) # false

docs/classes.md

@@ -67,7 +67,7 @@ class Person {
     }
 }
 
-person = Person("John", 20)
+const person = Person("John", 20)
 person.say_hello() # Output: Hello, John!
 ```
 

docs/control-flow.md

@@ -2,7 +2,7 @@
 
 ## Conditional statements
 
-Conditional statements are used to execute code based on a condition. In Rain,
+Conditional statements are used to execute code based on a condition. In Radon,
 the `if` statement is used to execute code if a condition is true. The `else`
 statement is used to execute code if the condition is false. The `elif`
 statement is used to execute code if the condition is false and another

docs/data-types.md

@@ -14,14 +14,14 @@ Arrays are declared using the `[]` syntax. The type of the array is the type
 of the elements it contains.
 
 ```rn linenums="1" title="arrays.rn"
-a = [1, 2, 3] # a is an array of numbers
-c = ["a", "b", "c"] # c is an array of strings
+var a = [1, 2, 3] # a is an array of numbers
+var c = ["a", "b", "c"] # c is an array of strings
 
 # Arrays can be nested
-d = [[1, 2], [3, 4]] # d is an array of arrays of ints
+var d = [[1, 2], [3, 4]] # d is an array of arrays of ints
 
 # Arrays can be empty
-e = [] # e is an empty array of unknown type
+var e = [] # e is an empty array of unknown type
 ```
 
 ## Hashmaps

docs/loops.md

@@ -179,7 +179,7 @@ for i=0 to 10 {
 While loop example:
 
 ```rn linenums="1" title="while_break.rn"
-i = 0
+var i = 0
 while i < 10 {
     if i == 5 {
         break