Merge pull request #383 from alexander-beedie/typos

trivial fix: typos

Author: wangxiaoying

Types.md

@@ -1,6 +1,6 @@
 # Supported Protocols, Data Types and Mappings
 
-**Currently we assume all columns are nullabel when inferring schema.**
+**Currently we assume all columns are nullable when inferring schema.**
 
 ## Postgres (Redshift)
 

connectorx/src/sources/postgres/typesystem.rs

@@ -103,7 +103,7 @@ impl<'a> From<&'a Type> for PostgresTypeSystem {
     }
 }
 
-// Link PostgresDTypes back to the one defiend by the postgres crate.
+// Link PostgresDTypes back to the one defined by the postgres crate.
 impl<'a> From<PostgresTypeSystem> for Type {
     fn from(ty: PostgresTypeSystem) -> Type {
         use PostgresTypeSystem::*;