minor options/README.md (#202)

exercises/options/README.md

@@ -1,14 +1,13 @@
 # Options
 
-Type Option represents an optional value: every Option is either Some and contains a value, or None, and does not.
-Option types are very common in Cairo code, as they have a number of uses:
+Type **`Option`** represents an optional value: every **`Option`** is either **`Some`** and contains a value, or *`None`**, and does not.
+**`Option`** types are very common in Cairo code, as they have a number of uses:
 
 - Initial values
 - Return values for functions that are not defined over their entire input range (partial functions)
-- Return value for otherwise reporting simple errors, where None is returned on error
+- Return value for otherwise reporting simple errors, where **`None`** is returned on error
 - Optional struct fields
 - Optional function arguments
-
 ## Further Information
 
 - [Option Implementation](https://book.cairo-lang.org/ch06-01-enums.html#the-option-enum-and-its-advantages)