docs(if): add documentation for if/elif/else

Signed-off-by: Flipez <code@brauser.io>

docs/docs/control_expressions/if.md

@@ -1,19 +1,26 @@
 ---
-title: "If"
+title: "If / elif / else"
 menu:
   docs:
     parent: "controls"
 ---
+import CodeBlockSimple from '@site/components/CodeBlockSimple'
+
 # If
 With `if` and `else` keywords the flow of a program can be controlled.
 
-```js
-🚀 > if (a.type() == "STRING")
-  puts("is a string")
+<CodeBlockSimple input='if (a.type() == "STRING")
+puts("is a string")
 else
-  puts("is not a string")
-end
+puts("is not a string")
+end' output='is a string' />
+
+# Elif
+`elif` allows providing of an additional consequence check  after `if` and before evaluating the alternative provided by `else`. There is no limit on how many `elif` statements can be used.
 
-// which prints
-is a string
-```
+<CodeBlockSimple input='if (a.type() == "BOOLEAN")
+puts("is a boolean")
+elif (a.type() == "STRING")
+puts("is a string")
+else
+puts("i have no idea")' output='is a string' />