Clean up docs for optional return argument

src/galois/_codes/_linear.py

@@ -142,7 +142,7 @@ def decode(self, codeword, output="message", errors=False):
  If `output="message"`, the error-corrected message as either a :math:`k`-length vector or :math:`(N, k)` matrix.
  If `output="codeword"`, the error-corrected codeword as either a :math:`n`-length vector or :math:`(N, n)` matrix.
  :
- Optional return argument of the number of corrected symbol errors as either a scalar or :math:`N`-length array.
+ If `errors=True`, returns the number of corrected symbol errors as either a scalar or :math:`N`-length array.
  Valid number of corrections are in :math:`[0, t]`. If a codeword has too many errors and cannot be corrected,
  -1 will be returned.