Document jreleaser/jreleaser#2002

Author: emlun

docs/modules/reference/pages/signing.adoc

@@ -46,6 +46,7 @@ signing:
   mode: MEMORY
 
   # The passphrase required to read secret keys.
+  # If not set and mode = `COMMAND`, the command may ask for the passphrase interactively.
   # icon:dot-circle[] icon:eye-slash[]
   passphrase: __USE_ENVIRONMENT_VARIABLE__
 
@@ -161,6 +162,7 @@ TOML::
   mode = 'MEMORY'
 
   # The passphrase required to read secret keys.
+  # If not set and mode = `COMMAND`, the command may ask for the passphrase interactively.
   # icon:dot-circle[] icon:eye-slash[]
   passphrase = "__USE_ENVIRONMENT_VARIABLE__"
 
@@ -276,6 +278,7 @@ JSON::
     "mode": "MEMORY",
 
     // The passphrase required to read secret keys.
+    // If not set and mode = `COMMAND`, the command may ask for the passphrase interactively.
     // icon:dot-circle[] icon:eye-slash[]
     "passphrase": "__USE_ENVIRONMENT_VARIABLE__",
 
@@ -411,6 +414,7 @@ Maven::
     <!--
       The passphrase required to read secret keys.
       Required when mode = `MEMORY` || `FILE`.
+      If not set and mode = `COMMAND`, the command may ask for the passphrase interactively.
       icon:dot-circle[] icon:eye-slash[]
     -->  
     <passphrase>__USE_ENVIRONMENT_VARIABLE__</passphrase>
@@ -564,6 +568,7 @@ jreleaser {
     mode = 'MEMORY'
 
     // The passphrase required to read secret keys.
+    // If not set and mode = `COMMAND`, the command may ask for the passphrase interactively.
     // icon:dot-circle[] icon:eye-slash[]
     passphrase = '__USE_ENVIRONMENT_VARIABLE__'