Fix misdescription in escapechar (pandas-dev#24490)

Closes pandas-devgh-23717

Author: thoo

pandas/io/parsers.py

@@ -261,7 +261,7 @@
    whether or not to interpret two consecutive quotechar elements INSIDE a
    field as a single ``quotechar`` element.
 escapechar : str (length 1), optional
-    One-character string used to escape delimiter when quoting is QUOTE_NONE.
+    One-character string used to escape other characters.
 comment : str, optional
     Indicates remainder of line should not be parsed. If found at the beginning
     of a line, the line will be ignored altogether. This parameter must be a