[APInt] Move a comment from urem to srem where it belongs.

[craig.topper]

Summary

This comment talks about sign of the dividend and the result. I
think it belongs to the srem function.

This is the commit that added it
https://github.com/llvm/llvm-project/commit/709a820a5338ca5c4b949f2f0286f7da39f00661
and the code change with it was for srem.

[nikic]

LGTM

llvm/include/llvm/ADT/APInt.h

#endif
   /// The result is rounded towards zero.
   APInt sdiv(const APInt &RHS) const;
   APInt sdiv(int64_t RHS) const;
 
   /// Unsigned remainder operation.
   ///
   /// Perform an unsigned remainder operation on this APInt with RHS being the
   /// divisor. Both this and RHS are treated as unsigned quantities for purposes
-  /// of this operation. Note that this is a true remainder operation and not a
-  /// modulo operation because the sign follows the sign of the dividend which
-  /// is *this.
+  /// of this operation.
   ///
   /// \returns a new APInt value containing the remainder result
   APInt urem(const APInt &RHS) const;
   uint64_t urem(uint64_t RHS) const;
 
   /// Function for signed remainder operation.
   ///
   /// Signed remainder operation on APInt.
+  ///
+  /// Note that this is a true remainder operation and not a modulo operation
+  /// because the sign follows the sign of the dividend which is *this.
   APInt srem(const APInt &RHS) const;
   int64_t srem(int64_t RHS) const;
 
   /// Dual division/remainder interface.
   ///
   /// Sometimes it is convenient to divide two APInt values and obtain both the
   /// quotient and remainder. This function does both operations in the same
   /// computation making it a little more efficient. The pair of input arguments