editted learning objectives to be more specific

Author: Eilis Hannon

_episodes/01-numpy.md

@@ -6,12 +6,12 @@ questions:
 - "How can I process tabular data files in Python?"
 objectives:
 - "Explain what a library is, and what libraries are used for."
-- "Import a Python library and use the things it contains."
+- "Import a Python library and use the functions it contains."
 - "Read tabular data from a file into a program."
 - "Assign values to variables."
 - "Select individual values and subsections from data."
 - "Perform operations on arrays of data."
-- "Display simple graphs."
+- "Plot simple graphs from data."
 keypoints:
 - "Import a library into a program using `import libraryname`."
 - "Use the `numpy` library to work with arrays in Python."

_episodes/04-files.md

@@ -6,7 +6,7 @@ questions:
 - "How can I do the same operations on many different files?"
 objectives:
 - "Use a library function to get a list of filenames that match a simple wildcard pattern."
-- "Use a for loop to process multiple files."
+- "Write a for loop to process multiple files."
 keypoints:
 - "Use `glob.glob(pattern)` to create a list of files whose names match a pattern."
 - "Use `*` in a pattern to match zero or more characters, and `?` to match any single character."