add zig guidelines link

Signed-off-by: Owen-sz <owen@fyralabs.com>

Author: Owen-sz

pages/terra/srpm.mdx

@@ -67,4 +67,4 @@ For other macros available in Fedora/Terra, check out our unofficial [macros lis
 | `%npm_license`                  |                                                                        |
 | `%node_self_test`               |                                                                        |
 | `%npm_test`                     |                                                                        |
-| `%zig_build_target`             |                                                                        |
+| `%zig_build_target`             | Check out our Zig packaging guidelines [here](https://developer.fyralabs.com/terra/policy#zig) |