README with misordered skip of shell commands

[mikekgfb]

🐛 Describe the bug

the skip begin markup on line 283 of README.md has no corresponding skip end markup, meaning all user commands after line 283 are suppressed and none tested until the end markup command. (Conversely, there appears to be a lone unmatched skip end at line 219. Likely this occurred during somnme README.md restructuring.)

#1299 should fixing the immediate problem, once a fix is landed we can add checking for properly balanced skip begin/end to catch this in the future in updown.py

Versions

Visual observation independent of versions

[mikekgfb]

Resolved by #1299 and #1309