docs: clarify configuration requirements for standalone certificates (#1045)

* fix(Standalone-certificates.md): Clarify configuration requirements

* fix(Standalone-certificates.md): remove extra space

* Update docs/Standalone-certificates.md

Co-authored-by: Nicolas Duchon <nicolas.duchon@gmail.com>

Author: Zvezdin

docs/Standalone-certificates.md

@@ -32,7 +32,7 @@ The user configuration file is a collection of bash variables and array, and fol
 
 `LETSENCRYPT_uniqueidentifier_HOST` : a bash array containing domain(s) that will be covered by the certificate corresponding to `uniqueidentifier`.
 
-Each identifier in `LETSENCRYPT_STANDALONE_CERTS` must have its own corresponding `LETSENCRYPT_uniqueidentifier_HOST` array.
+Each identifier in `LETSENCRYPT_STANDALONE_CERTS` must have its own corresponding `LETSENCRYPT_uniqueidentifier_HOST` array, where the string `uniqueidentifier` has to be identical to that identifier. 
 
 **Minimal example generating a single certificate for a single domain:**