chore(registry): normalize RFC standard naming (remove space before number) (#808)

## Summary
Normalize RFC standard naming in `schema/cryptography-defs.json` by
removing the space between `RFC` and the number.

## References
- Issue: #804

## Change
- `RFC 5116` -> `RFC5116`
- `RFC 3686` -> `RFC3686`

## Validation
- `python3 -m json.tool schema/cryptography-defs.json` (JSON OK)

Author: stevespringett

schema/cryptography-defs.json

@@ -330,7 +330,7 @@
           "url": "https://doi.org/10.6028/NIST.SP.800-38A"
         },
         {
-          "name": "RFC 5116",
+          "name": "RFC5116",
           "url": "https://doi.org/10.17487/RFC5116"
         }
       ],
@@ -356,7 +356,7 @@
         {
           "standard": [
             {
-              "name": "RFC 3686",
+              "name": "RFC3686",
               "url": "https://doi.org/10.17487/RFC3686"
             }
           ],