Update doc [ci skip]

mrkn · mrkn · commit d6a1dc8e0d19 · 2018-03-16T15:53:38.000+09:00
diff --git a/ext/enumerable/statistics/extension/statistics.c b/ext/enumerable/statistics/extension/statistics.c
@@ -1525,7 +1525,8 @@ enum_sample_multiple_unweighted(VALUE obj, long size, VALUE random, int replace_
  * Choose a random element or +n+ random elements from the enumerable.
  *
  * The enumerable is completely scanned just once for choosing random elements
- * even if +n+ is ommitted or +n+ is +1+.
+ * even if +n+ is ommitted or +n+ is +1+.  This means this method cannot be
+ * applicable to an infinite enumerable.
  *
  * +replace:+ keyword specifies whether the sample is with or without
  * replacement.

Original file line number	Diff line number	Diff line change
`@@ -1525,7 +1525,8 @@ enum_sample_multiple_unweighted(VALUE obj, long size, VALUE random, int replace_`
`1525`	`1525`	`* Choose a random element or +n+ random elements from the enumerable.`
`1526`	`1526`	`*`
`1527`	`1527`	`* The enumerable is completely scanned just once for choosing random elements`
`1528`		`- * even if +n+ is ommitted or +n+ is +1+.`
	`1528`	`+ * even if +n+ is ommitted or +n+ is +1+. This means this method cannot be`
	`1529`	`+ * applicable to an infinite enumerable.`
`1529`	`1530`	`*`
`1530`	`1531`	`* +replace:+ keyword specifies whether the sample is with or without`
`1531`	`1532`	`* replacement.`