INSTALL.md: Fix typo

CLA:trivial

Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
Reviewed-by: Paul Yang <kaishen.yy@antfin.com>
Reviewed-by: Paul Dale <pauli@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from #19882)

(cherry picked from commit 0e4e03c)

INSTALL.md

@@ -244,9 +244,8 @@ and issue the following command.
 
     $ nmake install
 
-The easiest way to elevate the Command Prompt is to press and hold down
-the both the `<CTRL>` and `<SHIFT>` key while clicking the menu item in the
-task menu.
+The easiest way to elevate the Command Prompt is to press and hold down 
+both the `<CTRL>` and `<SHIFT>` keys while clicking the menu item in the task menu.
 
 The default installation location is