Julia queries: fix non-consecutive docstring highlight

runtime/queries/julia/injections.scm

@@ -1,7 +1,7 @@
 (
   (source_file
-    (
     (string_literal) @injection.content
+    .
     [
       (module_definition)
       (function_definition)
@@ -11,8 +11,7 @@
       (struct_definition)
       (assignment_expression)
       (const_statement)
-      ]
+    ])
-    ))
   (#set! injection.language "markdown"))
 
 (