Update readme.md

foobar/readme.md

@@ -12,7 +12,7 @@ BOM (per side)
     15 MX compatible PCB mount switches
     1 TRRS Jack Sparkfun PRT-12639
     1 Pro Micro 5v
-    2 12mm headers or 1 24pin machined pin wide socket
+    2 12pin headers or 1 24pin machined pin wide socket
     1 5.2mm SMT switch (RESET) https://lcsc.com/product-detail/Tactile-Switches_5-2mm-5-2mm_C92584.html
 
 [How to order PCBs from gerber files](http://www.40percent.club/2017/03/ordering-pcb.html)