Fix typo

Author: wooorm

readme.md

@@ -72,7 +72,7 @@ Not used in the SVG space.
 
 ###### `options.upperDoctype`
 
-Use an `<!DOCTYPE…` instead of `<!doctype…`.
+Use a `<!DOCTYPE…` instead of `<!doctype…`.
 Useless except for XHTML (`boolean`, default: `false`).
 
 ###### `options.quote`

types/index.d.ts

@@ -35,7 +35,7 @@ declare namespace hastUtilToHtml {
     voids: string[]
 
     /**
-     * Use an `<!DOCTYPE…` instead of `<!doctype…`.
+     * Use a `<!DOCTYPE…` instead of `<!doctype…`.
      * Useless except for XHTML.
      *
      * @defaultValue false