Some spelling corrections

README.md

@@ -1,6 +1,6 @@
 # Drawing-with-Metapost
 
-Toby Thurston -- 29 Oct 2024
+Toby Thurston -- 31 Oct 2024
 
 This project provides a document that discusses how to draw technical diagrams
 with John Hobby's Metapost language. It includes over 200 illustrations created
@@ -23,17 +23,17 @@ These listings are included directly from the source code used, so in all cases
 the output should exactly match what you see on the page.
 
 You might like to read the main document first, but you might also like to
-browse through the PDFs in the src directory, and when you find one that is
+browse through the PDFs in the `src` directory, and when you find one that is
 interesting, have a look at the corresponding MP source file.  There is a
 one-to-one match between the PDF names and the MP source names, so
-`geometry-apollonius.pdf` is created from `geometry-apollonius.mp`.  The src
+`geometry-apollonius.pdf` is created from `geometry-apollonius.mp`.  The `src`
 directory contains a few drawings that are not included in the main document.
 
 To update the main PDF document I follow these steps
 
 - build any new or updated Metapost source files with `lualatex` to create PDFs in the src directory
 - build the main tex file with `lualatex -recorder Drawing-with-Metapost`
-- run a Python script to read the .fls and `git add` all the files used
+- run a Python script to read the `.fls` and `git add` all the files used
 - git commit and push
 
 If you find any errors, or have any suggestions for improvement, please raise an