minor text changes

Author: mjsandells

_episodes/05-loop.md

@@ -160,7 +160,7 @@ being the first loop cycle, and 6 being the final loop cycle).
 We can call the [loop variable]({{ page.root }}/reference.html#loop-variable) anything we like, but
 there must be a colon at the end of the line starting the loop, and we must indent anything we
 want to run inside the loop. Unlike many other languages, there is no command to signify the end
-of the loop body (e.g. `end for`); what is indented after the `for` statement belongs to the loop.
+of the loop body (e.g. `end for`); everything indented after the `for` statement belongs to the loop.
 
 
 > ## What's in a name?

_episodes/12-cmdline.md

@@ -18,7 +18,7 @@ keypoints:
 The Jupyter Notebook and other interactive tools are great for prototyping code and exploring data,
 but sooner or later we will want to use our program in a pipeline
 or run it in a shell script to process thousands of data files.
-In order to do that,
+In order to do that in an efficient way,
 we need to make our programs work like other Unix command-line tools.
 For example,
 we may want a program that reads a dataset
@@ -79,7 +79,7 @@ We'll tackle these questions in turn below.
 
 ## Command-Line Arguments
 
-Using the text editor of your choice,
+We are going to create a file with our python code in, then use the bash shell to run the code. Using the text editor of your choice,
 save the following in a text file called `sys_version.py`:
 
 ~~~