Note about font choice for addresses (#1160)

* Note about font choice for addresses

Tiny addition the visual formatting paragraph in the address page in the glossary, based on the conversation in #1134.

* Add specific font examples

Author: GBKS

guide/glossary/address.md

@@ -39,6 +39,17 @@ https://www.figma.com/file/qr4P17z6WSPADm6oW0cKw2/?node-id=25%3A2
 %}
 
 # Address
+{:.no_toc}
+
+---
+
+<div class="glossary-toc" markdown="1">
+* Table of contents
+{:toc}
+</div>
+
+---
+
 A bitcoin address is a 26-62 alphanumeric character identifier that is used to receive bitcoin. There are several address formats based on different specifications.
 
 When users enter an address, these formats have specific prefixes, so it is possible to determine which format is being used.
@@ -111,6 +122,8 @@ Handling addresses can be stressful when sending bitcoin. Transactions cannot be
 
 Especially when addresses are displayed in a compacted way, make sure to offer a more easily readable alternative. Spacing, subtle coloration, and use of mono-space fonts help users identify chunks of the address to compare, and distinguish characters better.
 
+Choose a typeface whose characters can be clearly distinguished (such as [Source Code Pro](https://github.com/adobe-fonts/source-code-pro) or [Fira Mono](https://github.com/mozilla/Fira)). Keep in mind that each address format has a different set of supported characters. For example, [Bech32](https://github.com/bitcoin/bips/blob/master/bip-0173.mediawiki#user-content-Segwit_address_format) addresses do not allow _"1"_, _"b"_, _"i"_, and _"o"_ in their data parts.
+
 </div>
 
 ## Address validation