internal/postgres: fix misspelling of preferred

Change-Id: I50871bf562b13ecca2bc683a43fca708ae1722b1
Reviewed-on: https://go-review.googlesource.com/c/pkgsite/+/260457
Trust: Julie Qiu <julie@golang.org>
Run-TryBot: Julie Qiu <julie@golang.org>
TryBot-Result: kokoro <noreply+kokoro@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
diff --git a/internal/postgres/path.go b/internal/postgres/path.go
index a7d892a..d9a25c4 100644
--- a/internal/postgres/path.go
+++ b/internal/postgres/path.go
@@ -24,7 +24,7 @@
 // (4) prerelease, incompatible
 // (5) pseudo
 // They are then sorted based on semver, then decreasing module path length (so
-// that nested modules are prefered).
+// that nested modules are preferred).
 const orderByLatest = `
 			ORDER BY
 				CASE