Fix wrong section hierarchy in the manual (nim-lang#12724) [backport]

(cherry picked from commit bfad005)

doc/manual.rst

@@ -6638,15 +6638,6 @@ The compiler needs to be told to generate C++ (command ``cpp``) for
 this to work. The conditional symbol ``cpp`` is defined when the compiler
 emits C++ code.
 
-
-ImportJs pragma
----------------
-
-Similar to the `importcpp pragma for C++ <#foreign-function-interface-importc-pragma>`_,
-the ``importjs`` pragma can be used to import Javascript methods or
-symbols in general. The generated code then uses the Javascript method
-calling syntax: ``obj.method(arg)``.
-
 Namespaces
 ~~~~~~~~~~
 
@@ -6829,6 +6820,15 @@ Produces:
   std::vector<int>::iterator x;
 
 
+ImportJs pragma
+---------------
+
+Similar to the `importcpp pragma for C++ <#foreign-function-interface-importc-pragma>`_,
+the ``importjs`` pragma can be used to import Javascript methods or
+symbols in general. The generated code then uses the Javascript method
+calling syntax: ``obj.method(arg)``.
+
+
 ImportObjC pragma
 -----------------
 Similar to the `importc pragma for C