math: fix typo in sqrt.go code comment

"it does not necessary" -> "it is not necessary"

Change-Id: I66f9cf2670d76b3686badb4a537b3ec084447d62
GitHub-Last-Rev: 52a0f9993abf25369cdb6b31eaf476df1626cf87
GitHub-Pull-Request: golang/go#43935
Reviewed-on: https://go-review.googlesource.com/c/go/+/287052
Reviewed-by: Robert Griesemer <gri@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Robert Griesemer <gri@golang.org>

diff --git a/src/math/sqrt.go b/src/math/sqrt.go
index 7e95f2365b8d387ac60ac3d31df6b050e352060f..1077a62897d94ce7a69d4dcd573b82962e54a469 100644 (file)
--- a/src/math/sqrt.go
+++ b/src/math/sqrt.go
@@ -67,7 +67,7 @@ package math
 //
 //      One may easily use induction to prove (4) and (5).
 //      Note. Since the left hand side of (3) contain only i+2 bits,
-//            it does not necessary to do a full (53-bit) comparison
+//            it is not necessary to do a full (53-bit) comparison
 //            in (3).
 //   3. Final rounding
 //      After generating the 53 bits result, we compute one more bit.