Improve captcha documentation to provide example captcha string format

Signed-off-by: Jason Trumpio <jason@trumpio.com>

Author: jtrumpio

doc/EXAMPLES.md

@@ -23,7 +23,7 @@ e.g:
   When you try to register a number, if you receive a response like `{"error":"Captcha required for verification (null)\n"}` then Signal is requiring a captcha. To register the number you must do the following:
   1. Go to  [https://signalcaptchas.org/registration/generate.html](https://signalcaptchas.org/registration/generate.html)
   2. Open the developer console
-  3. Find the line that looks like this: `Prevented navigation to “signalcaptcha://{captcha value}” due to an unknown protocol.` Copy the captcha value (e.g. “`signal-hcaptcha-short.xxxxx.registration.yyyyyy`”).  Note: do not include “`signalcaptcha://`”.
+  3. Find the line that looks like this: `Prevented navigation to “signalcaptcha://{captcha value}” due to an unknown protocol.` Copy the captcha value (e.g. `signal-hcaptcha-short.xxxxx.registration.yyyyyy`).  Note: do not include `signalcaptcha://`.
   4. Use it to make the registration call like this:
 
   `curl -X POST -H "Content-Type: application/json" -d '{"captcha":"captcha value"}' 'http://127.0.0.1:8080/v1/register/<number>'`