Fix readme typo (#422)

readme.md

@@ -839,7 +839,7 @@ There are many advanced types most users don't know about.
 	type T2 = Uppercase<'foo' | 'bar'>;  // 'FOO' | 'BAR'
 
 	type T3<S extends string> = Uppercase<`aB${S}`>;
-	type T4 = T30<'xYz'>;  // 'ABXYZ'
+	type T4 = T3<'xYz'>;  // 'ABXYZ'
 
 	type T5 = Uppercase<string>;  // string
 	type T6 = Uppercase<any>;  // any
@@ -860,7 +860,7 @@ There are many advanced types most users don't know about.
 	type T2 = Lowercase<'FOO' | 'BAR'>;  // 'foo' | 'bar'
 
 	type T3<S extends string> = Lowercase<`aB${S}`>;
-	type T4 = T32<'xYz'>;  // 'abxyz'
+	type T4 = T3<'xYz'>;  // 'abxyz'
 
 	type T5 = Lowercase<string>;  // string
 	type T6 = Lowercase<any>;  // any
@@ -881,7 +881,7 @@ There are many advanced types most users don't know about.
 	type T2 = Capitalize<'foo' | 'bar'>;  // 'Foo' | 'Bar'
 
 	type T3<S extends string> = Capitalize<`aB${S}`>;
-	type T4 = T32<'xYz'>;  // 'ABxYz'
+	type T4 = T3<'xYz'>;  // 'ABxYz'
 
 	type T5 = Capitalize<string>;  // string
 	type T6 = Capitalize<any>;  // any
@@ -902,7 +902,7 @@ There are many advanced types most users don't know about.
 	type T2 = Uncapitalize<'Foo' | 'Bar'>;  // 'foo' | 'bar'
 
 	type T3<S extends string> = Uncapitalize<`AB${S}`>;
-	type T4 = T30<'xYz'>;  // 'aBxYz'
+	type T4 = T3<'xYz'>;  // 'aBxYz'
 
 	type T5 = Uncapitalize<string>;  // string
 	type T6 = Uncapitalize<any>;  // any