chore: summaryのリンクをconnectからConnectに修正

Related: 5e9f72e (azu#48)

Because textlint-rule-prh skips child nodes of a Syntax.Link node, this
is not pointed out by `npm test`.

Author: vzvu3k6k

SUMMARY.md

@@ -4,5 +4,5 @@
 * [Introduction](ja/introduction/README.md)
 * [jQuery](ja/jQuery/README.md)
 * [ESLint](ja/ESLint/README.md)
-* [connect](ja/connect/README.md)
+* [Connect](ja/connect/README.md)