fix docs

Author: seangransee

docs/api.md

@@ -20,7 +20,7 @@ Chromeless provides TypeScript typings.
 - [`mousedown()`](#api-mousedown) - Not implemented yet
 - [`mouseup()`](#api-mouseup) - Not implemented yet
 - [`scrollTo(x: number, y: number)`](#api-scrollto)
-- [`setDocumentContent(html: string)`](#api-setdocumentcontent)
+- [`setHtml(html: string)`](#api-sethtml)
 - [`viewport(width: number, height: number)`](#api-viewport)
 - [`evaluate<U extends any>(fn: (...args: any[]) => void, ...args: any[])`](#api-evaluate)
 - [`inputValue(selector: string)`](#api-inputvalue)
@@ -256,9 +256,9 @@ await chromeless.scrollTo(500, 0)
 
 ---------------------------------------
 
-<a name="api-setdocumentcontent" />
+<a name="api-sethtml" />
 
-### setDocumentContent(html: string): Chromeless<T>
+### setHtml(html: string): Chromeless<T>
 
 Sets given markup as the document's HTML.
 
@@ -268,7 +268,7 @@ __Arguments__
 __Example__
 
 ```js
-await chromeless.setDocumentContent('<h1>Hello world!</h1>')
+await chromeless.setHtml('<h1>Hello world!</h1>')
 ```
 
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