Update arc-print-spooler-experiment flag

Update the description of the arc-print-spooler-experiment flag to
reflect that it is no longer restricted to the Canary and Dev channels.

Bug: b:151731767
Change-Id: Ia550b913422e6b84225c754948552e647558f5d4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2107419Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Jesse Schettler <jschettler@chromium.org>
Cr-Commit-Position: refs/heads/master@{#751053}

chrome/browser/flag_descriptions.cc

@@ -2996,8 +2996,7 @@ const char kArcNativeBridgeToggleDescription[] =
 const char kArcPrintSpoolerExperimentName[] =
     "Enable print spooler experiment for ARC";
 const char kArcPrintSpoolerExperimentDescription[] =
-    "Enables using Chrome OS print system and print preview in ARC."
-    "This feature only works on the Canary and Dev channels.";
+    "Enables using the Chrome OS print system and print preview in ARC.";
 
 const char kArcUsbHostName[] = "Enable ARC USB host integration";
 const char kArcUsbHostDescription[] =