Julia queries: fix non-consecutive docstring highlight

runtime/queries/julia/injections.scm

@@ -1,18 +1,17 @@
 (
   (source_file
-    (
+    (string_literal) @injection.content
-      (string_literal) @injection.content
+    .
-      [
+    [
-        (module_definition)
+      (module_definition)
-        (function_definition)
+      (function_definition)
-        (macro_definition)
+      (macro_definition)
-        (primitive_definition)
+      (primitive_definition)
-        (abstract_definition)
+      (abstract_definition)
-        (struct_definition)
+      (struct_definition)
-        (assignment_expression)
+      (assignment_expression)
-        (const_statement)
+      (const_statement)
-      ]
+    ])
-    ))
   (#set! injection.language "markdown"))
 
 (