change name debuger to debugger (#10949)

Author: Haichao-Zhang

python/paddle/fluid/debuger.py renamed to python/paddle/fluid/debugger.py

@@ -15,7 +15,7 @@
 import unittest
 import paddle.fluid as fluid
 import paddle.fluid.core as core
-from paddle.fluid import debuger
+from paddle.fluid import debugger
 from paddle.fluid.framework import Program
 
 
@@ -51,9 +51,9 @@ def test_debug_str(self):
             outputs={"Out": mul_out},
             attrs={"x_num_col_dims": 1})
 
-        print(debuger.pprint_program_codes(p))
+        print(debugger.pprint_program_codes(p))
 
-        debuger.draw_block_graphviz(p.block(0), path="./test.dot")
+        debugger.draw_block_graphviz(p.block(0), path="./test.dot")
 
 
 if __name__ == '__main__':