Merge pull request #619 from SasView/617-documentation-error-for-lame…

…llar_stack_paracrystal-model

Fixed typos, S(Q) calc verified with Bergström 1999

As the review says, this fixes the error and should be put into the imminent bug fix point release. The suggestion in the review will likely take longer to get sorted/agreed than time permits and is not so much an error fix as an enhancement. Thus I am merging this pull request.

sasmodels/models/lamellar_stack_paracrystal.py

@@ -56,7 +56,7 @@
 
 .. math::
 
-    S_N(q) = \frac{a_N}{N}[1 + w^2 - 2 w \cos(q \langle D \rangle)]^2
+    S_N(q) = \frac{a_N}{N[1 + w^2 - 2 w \cos(q \langle D \rangle)]^2}
 
 and
 
@@ -95,7 +95,7 @@
 
 * **Author:**
 * **Last Modified by:**
-* **Last Reviewed by:**
+* **Last Reviewed by:** Oliver Hammond, **Date:**  January 9, 2025
 """
 import numpy as np
 from numpy import inf
@@ -105,7 +105,7 @@
 description = """\
     [Random lamellar phase with paracrystal structure factor]
         randomly oriented stacks of infinite sheets
-        with paracrytal S(Q), having polydisperse spacing.
+        with paracrystal S(Q), having polydisperse spacing.
         sld = sheet scattering length density
         sld_solvent = solvent scattering length density
         background = incoherent background