Errors in documentation for reverse-2d example

[baagaard-usgs]

• [x] Step 3: First line in viz command (Listing 122) is incorrect. It references step01.
• [x] Step 4 near beginning, missing period: distribution as shown in Fig. 91 We use
• [x] figure captions. We use ’show’ instead of ’shown’. undeformed configuration is show by the gray wireframe
• [x] Step 5, last line of Key Points: without substatially
• [x] Viz command for step 6: wrong filename in command (Listing 144).
• [x] Also just noticed that the solution viz for steps 6,7,8 are Paraview rather than pylith_viz
• [x] Step 8: When copying the pylith_powerlaw_gendb command, the copy also picks up the $ at the beginning
• [x] Suggested Exercises, #3: How does this affec the solution