fix: cosmetic change

Signed-off-by: Gabriele Bartolini <gabriele.bartolini@enterprisedb.com>

Author: gbartolini

templates/metadata.hcl.tmpl

@@ -10,7 +10,7 @@ metadata = {
   image_name               = "{{ .Name }}"
 
   # TODO: Remove this comment block after customizing the file.
-  # `licenses`: The SPDX license identifier for the extension software.
+  # `licenses`: The SPDX license identifier(s) for the extension software.
   # Examples: "Apache-2.0", "PostgreSQL", "GPL-2.0-only".
   # See: https://spdx.org/licenses/
   licenses                 = "Apache-2.0"