docs: flavours -> flavors

We generally prefer US English over UK English in the docs.

Reviewed-by: Eric Anholt <eric@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6894>
diff --git a/docs/gallium/context.rst b/docs/gallium/context.rst
index 8cf1f4f..c0667f8 100644
--- a/docs/gallium/context.rst
+++ b/docs/gallium/context.rst
@@ -40,7 +40,7 @@
 Resource Binding State
 ^^^^^^^^^^^^^^^^^^^^^^
 
-This state describes how resources in various flavours (textures,
+This state describes how resources in various flavors (textures,
 buffers, surfaces) are bound to the driver.