DOC: applied gfyoung's feedback

PR pandas-dev#21406

Author: deflatSOCO

doc/source/whatsnew/v0.24.0.txt

@@ -221,6 +221,7 @@ In [1]: data = pd.DataFrame({
    ...: })
 
 In [2]: # When passing file PATH to to_csv, line_terminator does not work, and csv is saved with '\r\n'.
+   ...: # Also, this converts all '\n's in the data to '\r\n'.
    ...: data.to_csv("test.csv", index=False, line_terminator='\n')
 
 In [3]: with open("test.csv", mode='rb') as f:
@@ -256,7 +257,7 @@ In [3]: with open("test.csv", mode='rb') as f:
 b'string_with_lf,string_with_crlf\n"a\nbc","a\r\nbc"\n'
 
 
-- On windows, the value of ``os.linesep`` is ``'\r\n'``,
+- On Windows, the value of ``os.linesep`` is ``'\r\n'``,
   so if ``line_terminator`` is not set, ``'\r\n'`` is used for line terminator.
 - Again, it does not affects the value inside the data.
 
@@ -274,8 +275,8 @@ In [3]: with open("test.csv", mode='rb') as f:
 b'string_with_lf,string_with_crlf\r\n"a\nbc","a\r\nbc"\r\n'
 
 
-- As default value of ``line_terminator`` changes, just passing file object with ``newline='\n'`` does not set ``'\n'`` to line terminator.
-  Pass ``line_terminator='\n'`` explicitly.
+- For files objects, specifying ``newline`` is not sufficient to set the line terminator.
+  You must pass in the ``line_terminator`` explicitly, even in this case.
 
 .. code-block:: ipython