Update README.md

README.md

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+    <td>Access & control PWM on RPi 5 using `sysfs` & 3 lines of <code>bash</code> code. 
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+    <td>Having problems getting PWM working on RPi 5? Here's a <em>simple</em> way to set that up.
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     <td>See the latest addition to the <a href="UsefulShellTricks.md">"Useful Shell Tricks"</a> recipe - on the <a href="UsefulShellTricks.md#verify-file-system-is-mounted"><code>findmnt</code></a> utility
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