fix some typos in {learners,episodes,instructors}/*.md

Author: warrickball

episodes/02-coords.md

@@ -582,7 +582,7 @@ The following function combines these steps.
 
 ```python
 def skycoord_to_string(skycoord):
-    """Convert a one-dimenstional list of SkyCoord to string for Gaia's query format."""
+    """Convert a one-dimensional list of SkyCoord to string for Gaia's query format."""
     corners_list_str = skycoord.to_string()
     corners_single_str = ' '.join(corners_list_str)
     return corners_single_str.replace(' ', ', ')

episodes/03-transform.md

@@ -287,7 +287,7 @@ black, round marker (`k` is for black because `b` is for blue).
 The functions `xlabel` and `ylabel` put labels on the axes.
 
 Looking at this plot, we can see that the region we selected, which is
-a rectangle in GD-1 coordinates, is a non-rectanglar region in ICRS
+a rectangle in GD-1 coordinates, is a non-rectangular region in ICRS
 coordinates.
 
 However, this scatter plot has a problem.  It is

episodes/08-plot.md

@@ -15,7 +15,7 @@ exercises: 65
 :::::::::::::::::::::::::::::::::::::::: questions
 
 - What elements make a compelling visualization that authentically reports scientific results ready for scientific presentation and publication?
-- What tools and techinques are available to save time on creating presentation and publication-ready figures?
+- What tools and techniques are available to save time on creating presentation and publication-ready figures?
 
 ::::::::::::::::::::::::::::::::::::::::::::::::::
 
@@ -823,7 +823,7 @@ create figures that contain multiple panels.
 :::::::::::::::::::::::::::::::::::::::: keypoints
 
 - Effective figures focus on telling a single story clearly and authentically. The major decisions needed in creating an effective summary figure like this one can be done away from a computer and built up from low fidelity (hand drawn) to high (tweaking rcParams, etc.).
-- Consider using annotations to guide the reader’s attention to the most important elements of a figure, while keeping in mind accessiblity issues that such detail may introduce.
+- Consider using annotations to guide the reader’s attention to the most important elements of a figure, while keeping in mind accessibility issues that such detail may introduce.
 - The default Matplotlib style generates good quality figures, but there are several ways you can override the defaults.
 - If you find yourself making the same customizations on several projects, you might want to create your own style sheet.
 

instructors/instructor-notes.md

@@ -160,7 +160,7 @@ This idiom violates the recommendation not to repeat variables names, but since
 
 ### Episode 5: Coordinate transformation and selection
 
-- This is likely the first episode of Day 2. You should start by having learners start a new notebook. They will need to read in the data they saved yesterday to HDF5 files and the functions they wrote yesterday. You can follow the directions under the collapsable section at the beginning of this episode called "Starting from this episode". If you are using files from the `student_download` directory be sure to add the correct path `student_download/backup-data/<filename>`.
+- This is likely the first episode of Day 2. You should start by having learners start a new notebook. They will need to read in the data they saved yesterday to HDF5 files and the functions they wrote yesterday. You can follow the directions under the collapsible section at the beginning of this episode called "Starting from this episode". If you are using files from the `student_download` directory be sure to add the correct path `student_download/backup-data/<filename>`.
 
 - This episode is faster than it looks because learners have seen much of the content already
 

instructors/prereqs.md

@@ -46,7 +46,7 @@ The following skills are useful, but not required:
 - Apply a function to an entire Numpy array or to a single array axis.
 - Write a user-defined function.
 
-If you are signed up, or considering signing up for a workshop, and aren't sure whether you meet these reqirements, please
+If you are signed up, or considering signing up for a workshop, and aren't sure whether you meet these requirements, please
 get in touch with the workshop instructors or host.