Avoid Globbing in Curl examples

[laurenceisla]

Noticed in an SO answer that curl does Globbing by default when {} is present. So these should be percent encoded in the examples or use the -g parameter (I prefer the latter, looks cleaner).

[steve-chavez]

@laurenceisla IIRC using single quotes ' also prevents the globbing.

[laurenceisla]

@steve-chavez Just tested it, it still does the globbing with single quotes.