Fix check-api-docs.awk in FreeBSD
Fix check-api-docs.awk in FreeBSD

Quote a forward slash in a regular expression so that FreeBSD's native
version of awk accepts the pattern.

jmmv/kyua,rodrigc/kyua,jmmv/kyua,rodrigc/kyua,rodrigc/kyua,rodrigc/kyua,jmmv/kyua,jmmv/kyua