audio/pw: Pipewire->PipeWire case fix for user-visible text

"PipeWire" is the correct case.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Volker Rümelin <vr_qemu@t-online.de>
Message-Id: <20230506163735.3481387-4-marcandre.lureau@redhat.com>
diff --git a/qemu-options.hx b/qemu-options.hx
index f8f384e..29b98c3 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -963,10 +963,10 @@
         to honor this value but actual latencies may be lower or higher.
 
 ``-audiodev pipewire,id=id[,prop[=value][,...]]``
-    Creates a backend using Pipewire. This backend is available on
+    Creates a backend using PipeWire. This backend is available on
     most systems.
 
-    Pipewire specific options are:
+    PipeWire specific options are:
 
     ``in|out.latency=usecs``
         Desired latency in microseconds.