Fix some typos

Closes GH-225

Reviewed-by: Remco Haszing <remcohaszing@gmail.com>
Reviewed-by: Titus Wormer <tituswormer@gmail.com>

Author: ChristianMurphy

readme.md

@@ -1089,7 +1089,7 @@ Plugins configure the processors they are applied on in the following ways:
     configuring data
 *   they specify how to handle trees and files
 
-In practise, they are functions that can receive options and configure the
+In practice, they are functions that can receive options and configure the
 processor (`this`).
 
 > 👉 **Note**: plugins are called when the processor is *frozen*, not when they

script/fix-types.js

@@ -37,7 +37,7 @@ const result = file
 
 if (file === result) {
   console.error(
-    'Could not fix `lib/index.d.ts`, was `tsc` fixed somewhow? Or were changes already applied?'
+    'Could not fix `lib/index.d.ts`, was `tsc` fixed somehow? Or were changes already applied?'
   )
 } else {
   await fs.writeFile(url, result)