DOC: Reword doc for filepath_or_buffer in read_csv

Shortens dtype description following colon and
moves it to a more expanded parameter description.

Closes gh-22057.

Author: gfyoung

pandas/io/parsers.py

@@ -60,11 +60,18 @@
 
 Parameters
 ----------
-filepath_or_buffer : str, pathlib.Path, py._path.local.LocalPath or any \
-object with a read() method (such as a file handle or StringIO)
-    The string could be a URL. Valid URL schemes include http, ftp, s3, and
-    file. For file URLs, a host is expected. For instance, a local file could
-    be file://localhost/path/to/table.csv
+filepath_or_buffer : str, path object, or file object
+    Any valid string path is acceptable. The string could be a URL. Valid
+    URL schemes include http, ftp, s3, and file. For file URLs, a host is 
+    expected. A local file could be: file://localhost/path/to/table.csv.
+
+    If you want to pass in a path object, pandas accepts the following:
+
+    * pathlib.Path
+    * py._path.local.LocalPath
+
+    By file object, we refer to any object with a ``read()`` method, such as
+    a file handler (e.g. via builtin ``open`` function) or ``StringIO``.
 %s
 delim_whitespace : boolean, default False
     Specifies whether or not whitespace (e.g. ``' '`` or ``'\t'``) will be