Clarify virtual keyboard flag

Change-Id: I229fe8012c5ec1c9fac5f540f3d0ed68284adb99
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1860196Reviewed-by: Darren Shen <shend@chromium.org>
Commit-Queue: David Vallet <dvallet@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705699}

chrome/browser/flag_descriptions.cc

@@ -3687,7 +3687,9 @@ const char kVaapiWebPImageDecodeAccelerationDescription[] =
     "Enable or disable decode acceleration of WebP images using the VA-API.";
 
 const char kVirtualKeyboardName[] = "Virtual Keyboard";
-const char kVirtualKeyboardDescription[] = "Enable virtual keyboard support.";
+const char kVirtualKeyboardDescription[] =
+    "Always show virtual keyboard regardless of having a physical keyboard "
+    "present";
 
 const char kWakeOnPacketsName[] = "Wake On Packets";
 const char kWakeOnPacketsDescription[] =