docstring tweak

Author: boblat

docs/lg-types.md

@@ -97,7 +97,7 @@ See [Python builtins](lg-builtins.md#len---length) for an explanation of why `le
 
 ### FixedBytes
 
-[`algopy.FixedBytes[T]`](#algopy.FixedBytes) represents the underlying AVM `bytes[T]` type where `T` is the literal number denoting the length of the bytes sequence. It is intended to represent binary data, for UTF-8 it might be preferable to use [String](#string).
+[`algopy.FixedBytes[T]`](#algopy.FixedBytes) represents the underlying AVM `bytes[]` type where `T` is the literal number denoting the length of the bytes sequence. It is intended to represent binary data, for UTF-8 it might be preferable to use [String](#string).
 
 ```python
 # you can instantiate with a bytes literal