Update CONTRIBUTING.md

Co-Authored-By: Jordan Munch O'Hare <[email protected]>

CONTRIBUTING.md

@@ -128,7 +128,7 @@ This field is used in the _Flag - Country_ template.
 
 In Anki, when you keep on confusing two flags, you can't put them side by side to learn their visual differences. The _Flag similarity_ field works around this limitation by providing a concise description of the differences a flag has with another. It allows users to more easily learn to distinguish pairs of similar flags and perhaps come up with mnemonics to remember their respective countries.
 
-A note's _Flag similarity_ field contains a list of countries, each followed by a list of differences. For instance, the flag similarities for Iceland are written as follows: _Norway (red background, blue cross), Faroe Islands (white background, red and blue cross)_. The list of differences must be **precise**, **clear** and **concise**. Advanced [vexillological](https://en.wikipedia.org/wiki/Vexillology) terms should be avoided.
+A note's _Flag similarity_ field contains a list of countries, each followed by a list of differences. For instance, the flag similarities for Iceland are written as follows: _Norway (red background, blue cross), Faroe Islands (white background, red and blue cross)_. The list of differences must be **precise**, **clear**, and **concise**. Advanced [vexillological](https://en.wikipedia.org/wiki/Vexillology) terms should be avoided.
 
 Flag similarities are always **mutual**: if flag A is similar to flag B, then flag B is similar to flag A. To determine whether two flags are similar enough to warrant mutual _Flag similarity_ information, their differences must first be **identified** and **classified**. The following classification applies: