[spec] Add paragraph break for more emphasis (#1001)

document/core/binary/modules.rst

diff --git a/document/core/binary/modules.rst b/document/core/binary/modules.rst
index b667314..9c44b95 100644
--- a/document/core/binary/modules.rst
+++ b/document/core/binary/modules.rst
@@ -421,6 +421,7 @@
 :ref:`Custom sections <binary-customsec>` may be inserted at any place in this sequence,
 while other sections must occur at most once and in the prescribed order.
 All sections can be empty.
+
 The lengths of vectors produced by the (possibly empty) :ref:`function <binary-funcsec>` and :ref:`code <binary-codesec>` section must match up.
 
 .. math::