Update finite_field_base.pyx

Author: GiacomoPope

src/sage/rings/finite_rings/finite_field_base.pyx

@@ -2118,7 +2118,7 @@ cdef class FiniteField(Field):
                 for col in B.columns()]
 
     def from_bytes(self, input_bytes, byteorder="big"):
-        """
+        r"""
         Return the integer represented by the given array of bytes.
 
         Internally relies on the python ``int.from_bytes()`` method.