docs: apis -> APIs

Reviewed-by: Eric Engestrom <eric@engestrom.ch>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6864>
diff --git a/docs/gallium/context.rst b/docs/gallium/context.rst
index 12a9f63..f26bab4 100644
--- a/docs/gallium/context.rst
+++ b/docs/gallium/context.rst
@@ -45,7 +45,7 @@
 
 
 * ``set_constant_buffer`` sets a constant buffer to be used for a given shader
-  type. index is used to indicate which buffer to set (some apis may allow
+  type. index is used to indicate which buffer to set (some APIs may allow
   multiple ones to be set, and binding a specific one later, though drivers
   are mostly restricted to the first one right now).