Fix typos (#3646)

packages/docgen/src/docgen/GitHubMarkdownPrinter.ts

@@ -27,7 +27,7 @@ const COMMIT_SHA =
   execSync('git rev-parse HEAD').toString('utf8').trim();
 
 /**
- * The GithubMarkdownPrinter is a MarkdownPrinter for printing Github-flavored markdown documents.
+ * The GithubMarkdownPrinter is a MarkdownPrinter for printing GitHub Flavored Markdown documents.
  */
 export default class GithubMarkdownPrinter implements MarkdownPrinter {
   private str: string = '';

packages/docgen/src/docgen/types.ts

@@ -31,7 +31,7 @@ export type TypeLink = {
 };
 
 /**
- * TypeInfo describes a Typescript Type.
+ * TypeInfo describes a TypeScript Type.
  */
 export type TypeInfo = {
   id: number;