Mention github issue and PR in comments related to spec CI failures

src/simsopt/mhd/spec.py

@@ -141,7 +141,9 @@ def __init__(self,
  filename = f"{filename}.sp"
  logger.info(f"Initializing a SPEC object from file: {filename}")
 
- #If spec has run before, clear the f90wrap array caches.
+ # If spec has run before, clear the f90wrap array caches.
+ # See https://github.com/hiddenSymmetries/simsopt/pull/431
+ # This addresses the issue https://github.com/hiddenSymmetries/simsopt/issues/357
  if spec.allglobal._arrays:
  self._clear_f90wrap_array_caches()
 
@@ -722,7 +724,12 @@ def set_dofs(self, x):
 
  def _clear_f90wrap_array_caches(self):
  """
- Clear the f90wrap array caches. This is necessary when a new file is read after SPEC has run before.
+ Clear the f90wrap array caches. This is necessary when a new file is
+ read after SPEC has run before.
+
+ See https://github.com/hiddenSymmetries/simsopt/pull/431
+
+ This function is for addressing the issue https://github.com/hiddenSymmetries/simsopt/issues/357
  """
  spec.allglobal._arrays = {}
  spec.inputlist._arrays = {}