fix duplicate variable in example

Signed-off-by: varun-r-mallya <[email protected]>

Author: varun-r-mallya

examples/kprobes.py

@@ -10,7 +10,7 @@ def hello_world(ctx: c_void_p) -> c_int64:
 
 @bpf
 @section("kprobe/do_unlinkat")
-def hello_world(ctx: c_void_p) -> c_int64:
+def hello_world2(ctx: c_void_p) -> c_int64:
     print("Hello, World!")
     return c_int64(0)