(docs) grammar

docs/docs/scheme-intro/data-types.md

@@ -342,7 +342,7 @@ Most special symbols in Scheme start with a hash symbol. Example are Byte vector
 ```
 
 Above creates 8 bit byte vector of numbers. In R<sup>7</sup>RS, only unsigned 8 bit vectors are
-defined. But in [SRFI-4](https://srfi.schemers.org/srfi-4/srfi-4.html) are more bit vectors types.
-They all starts with hash. In different SRFI there are more examples of syntax's that start with
-hash. This is just a convention everything is using.
+defined. But in [SRFI-4](https://srfi.schemers.org/srfi-4/srfi-4.html) there are more bit vectors
+types.  They all starts with hash. In different SRFI there are more examples of syntax's that start
+with hash. This is just a convention everything is using.