Update to explain acronym SI

Author: wiggitywhitney

content/en/docs/reference/glossary/quantity.md

@@ -10,7 +10,7 @@ aka:
 tags:
 - core-object
 ---
- A whole-number representation of small or large numbers using SI suffixes.
+ A whole-number representation of small or large numbers using [SI](https://en.wikipedia.org/wiki/International_System_of_Units) suffixes.
 
 <!--more-->
 
@@ -21,11 +21,12 @@ mega, or giga units.
 
 For instance, the number `1.5` is represented as `1500m`, while the number `1000`
 can be represented as `1k`, and `1000000` as `1M`. You can also specify
-binary-notation suffixes; the number 2048 can be written as `2Ki`.
+[binary-notation](https://en.wikipedia.org/wiki/Binary_prefix) suffixes; the number 2048 can be written as `2Ki`.
 
 The accepted decimal (power-of-10) units are `m` (milli), `k` (kilo,
 intentionally lowercase), `M` (mega), `G` (giga), `T` (tera), `P` (peta),
 `E` (exa).
 
 The accepted binary (power-of-2) units are `Ki` (kibi), `Mi` (mebi), `Gi` (gibi),
 `Ti` (tebi), `Pi` (pebi), `Ei` (exbi).
+