docs: add missing shell option to execSync
docs: add missing shell option to execSync

Adds the "shell" option from child_process.exec to
child_process.execSync on the api docs.

Fixes: #3387
Reviewed-By: James M Snell <2d64a127ffc94dbe6295928a16bedf8b26814159@gmail.com>
Reviewed-By: Colin Ihrig <838f779c91673db29b8572ea3f54d191d3878ae2@gmail.com>
PR-URL: https://github.com/nodejs/node/pull/3440

dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node