Calculator.el doc:typo-fix

[T.V Raman]

Here is a simple patch to fix a typo in the doc string for M-x
calculator --- s/reminder/remainder/

git diff calculator.el
diff --git a/lisp/calculator.el b/lisp/calculator.el
index b6959af795..f559fb4828 100644
--- a/lisp/calculator.el
+++ b/lisp/calculator.el
@@ -627,7 +627,7 @@ calculator-mode
 
 These operators are pre-defined:
 * `+' `-' `*' `/' the common binary operators
-* `\\' `%'         integer division and reminder
+* `\\' `%'         integer division and remainder
 * `_' `;'         postfix unary negation and reciprocal
 * `^' `L'         binary operators for x^y and log(x) in base y
 * `Q' `!'         unary square root and factorial

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