update docstring

Author: MarcoGorelli

pandas/core/series.py

@@ -4208,7 +4208,7 @@ def replace(
 dtypes: object(1)
 memory usage: 80.0+ bytes
 
-Pipe output of DataFrame.info to buffer instead of sys.stdout, get
+Pipe output of Series.info to buffer instead of sys.stdout, get
 buffer content and writes to a text file:
 
 >>> import io