Document String array option type

- Fixes #628

spring-shell-docs/src/main/asciidoc/using-shell-options-types.adoc

@@ -117,3 +117,21 @@ include::{snippets}/OptionTypesSnippets.java[tag=option-type-enum-anno]
 include::{snippets}/OptionTypesSnippets.java[tag=option-type-enum-reg]
 ----
 ====
+
+==== Array
+
+Arrays can be used as is with strings and primitive types.
+
+====
+[source, java, indent=0]
+----
+include::{snippets}/OptionTypesSnippets.java[tag=option-type-string-array-anno]
+----
+====
+
+====
+[source, java, indent=0]
+----
+include::{snippets}/OptionTypesSnippets.java[tag=option-type-string-array-reg]
+----
+====

spring-shell-docs/src/test/java/org/springframework/shell/docs/OptionTypesSnippets.java

@@ -154,4 +154,29 @@ class OptionTypesSnippets {
 		}
 	}
 
+	class Dump5 {
+		// tag::option-type-string-array-anno[]
+		String example(@ShellOption(value = "arg1") String[] arg1) {
+			return "Hello " + arg1;
+		}
+		// end::option-type-string-array-anno[]
+		void dump() {
+		// tag::option-type-string-array-reg[]
+		CommandRegistration.builder()
+			.command("example")
+			.withOption()
+				.longNames("arg1")
+				.type(String[].class)
+				.required()
+				.and()
+			.withTarget()
+				.function(ctx -> {
+					String[] arg1 = ctx.getOptionValue("arg1");
+					return "Hello " + arg1;
+				})
+				.and()
+			.build();
+		// end::option-type-string-array-reg[]
+		}
+	}
 }