added files to io.rst
@@ -17,6 +17,18 @@ NumPy binary files (NPY, NPZ)
savez
savez_compressed
+Text files
+-----------------------------
+
+.. autosummary::
+ :toctree: generated/
+
+ savetxt
+ loadtxt
+ genfortext
+ fromregex
+ fromstring
+
String formatting
-----------------
