bug#31937: lisp/doc-view.el (typo correction)

[Van L]

diff --git a/lisp/doc-view.el b/lisp/doc-view.el
index 970e12402d..7b1fc01204 100644
--- a/lisp/doc-view.el
+++ b/lisp/doc-view.el
@@ -50,7 +50,7 @@
 ;; `doc-view-clear-cache'.  To open the cache with dired, so that you can tidy
 ;; it out use `doc-view-dired-cache'.
 ;;
-;; When conversion in underway the first page will be displayed as soon as it
+;; When conversion is underway the first page will be displayed as soon as it
 ;; is available and the available pages are refreshed every
 ;; `doc-view-conversion-refresh-interval' seconds.  If that variable is nil the
 ;; pages won't be displayed before conversion of the document finished