zweihander: Add :, disable sleep LED waves

keyboard/ergodox_ez/keymaps/zweihander-osx/makefile.mk

@@ -0,0 +1,2 @@
+# Don’t do a tricolor wave when the computer is shut down in Windows
+SLEEP_LED_ENABLE = no

keyboard/ergodox_ez/keymaps/zweihander-osx/readme.markdown

@@ -42,4 +42,4 @@ I press C-a, C-e, and C-k all the time. It’s difficult to press these key comb
 
 ## use spreadsheets
 
-All the common spreadsheet operations (+-*/=) are now on the right side of the symbol layer.
+All the common spreadsheet operations (+-*/=) are now on the right side of the symbol layer. There’s also a colon there for entering times and maybe IPv6 addresses. Not that I expect people to type IPv6 addresses into a spreadsheet, but, y’know.