fix typo

README.markdown

@@ -933,7 +933,7 @@ func computeFFT(context: Context?, inputData: InputData?) throws -> Frequencies
 }
 ```
 
-When multiple optionals are unwrapped either with `guard` or `if let`, minimize nesting by using the compound version when possible. In the compound version, place the `guard` on its own line, then ident each condition on its own line. The `else` clause is indented to match the conditions and the code is indented one additional level, as shown below. Example:
+When multiple optionals are unwrapped either with `guard` or `if let`, minimize nesting by using the compound version when possible. In the compound version, place the `guard` on its own line, then indent each condition on its own line. The `else` clause is indented to match the conditions and the code is indented one additional level, as shown below. Example:
 
 **Preferred**:
 ```swift
@@ -1105,7 +1105,7 @@ Smiley faces are a very prominent style feature of the [raywenderlich.com](https
 **Not Preferred**:
 ```
 :)
-```  
+```
 
 ## References