Merge branch '4-write-a-basic-test-simulation-and-user-guide-for-sphe…

…rical-harmonics-use' of github.com:MintonGroup/swiftest into 4-write-a-basic-test-simulation-and-user-guide-for-spherical-harmonics-use

docs/user-guide/gravitational-harmonics/index.rst

@@ -149,7 +149,7 @@ characteristic wavelength (:math:`\lambda`) of a harmonic degree (:math:`l`) to
 
     \lambda = \frac{2\pi R}{\sqrt{l(l+1)}} 
 
-    \lambda = R \rightarrow l = 6
+    \lambda = R \Rightarrow l = 6
 
 .. Final Steps for Running the Simulation
 .. =======================================