docs: clk: fix struct syntax

The clk_foo_ops struct example has syntax errors. Fix it so it can be
copy-pasted and used more easily.

Signed-off-by: Luca Ceresoli <[e-mail]>
Signed-off-by: Jonathan Corbet <[e-mail]>

Documentation/driver-api/clk.rst

···
 To take advantage of your data you'll need to support valid operations
 for your clk::
 
-	struct clk_ops clk_foo_ops {
-		.enable		= &clk_foo_enable;
-		.disable	= &clk_foo_disable;
+	struct clk_ops clk_foo_ops = {
+		.enable		= &clk_foo_enable,
+		.disable	= &clk_foo_disable,
 	};
 
 Implement the above functions using container_of::