Docs : Improve the design guide (#111)

- Use modal verbs instead of "has"
- Use "icons" instead of "each icon"
- change some other things as well

docs/ICON_DESIGN_GUIDE.md

@@ -4,46 +4,46 @@ Here are rules that should be followed to keep quality and consistency when maki
 
 ## Summary of the rules we have
 
-1. Each Icon is desined on a canvas of **24 by 24 pixels**.
-2. Each Icon have **1 pixel padding** between icon and the canvas.
-3. Each icon has a **stroke width of 2 pixels**.
-4. Each icon has **round joins**.
-5. Each icon has **round caps**.
-6. Each icon has **centered strokes**.
-7. Each icon containing squares has a **border radius of 2 pixels**.
-8. Each icon **2 pixels of spacing between elements**.
+1. Icons must be designed on a **24 by 24 pixels** canvas.
+2. Icons must have a **1 pixel padding** within the canvas.
+3. Icons must have a **stroke width of 2 pixels**.
+4. Icons must use **round joins**.
+5. Icons must use **round caps**.
+6. Icons must use **centered strokes**.
+7. Shapes (such as rectangles) in icons must have **border radius of 2 pixels**.
+8. Distinct elements must have **2 pixels of spacing between each other**.
 
 ## The Rules Visualized
 
-### 1. **Each Icon is desined on a canvas of 24 by 24 pixels**
+### 1. Icons must be designed on a 24 by 24 pixels canvas.
 
 ![24px-24px](images/24px-24px.png?raw=true "24px-24px")
 
-### 2. **Each Icon have 1 pixel between icon and the canvas**
+### 2. Icons must have a 1 pixel padding within the canvas.
 
 ![1px-padding](images/1px-padding.png?raw=true "1px-padding")
 
-### 3. **Each icon has a stroke width of 2 pixels**
+### 3. Icons must have a stroke width of 2 pixels.
 
 ![2px-stroke](images/2px-stroke.png?raw=true "2px-stroke")
 
-### 4. **Each icon has round joins**
+### 4. Icons must use round joins.
 
 ![round-joints](images/round-joints.png?raw=true "round-joints")
 
-### 5. **Each icon has round caps**
+### 5. Icons must use round caps.
 
 ![round-caps](images/round-caps.png?raw=true "round-caps")
 
-### 6. **Each icon has centered strokes**
+### 6. Icons must use centered strokes.
 
 ![centered-strokes](images/centered-strokes.png?raw=true "centered-strokes")
 
-### 7. **Each icon containing squares has a border radius of 2 pixels**
+### 7. Shapes (such as squares) in icons must have border radius of 2 pixels.
 
 ![2px-border-radius](images/2px-border-radius.png?raw=true "2px-border-radius")
 
-### 8. **Each icon 2 pixels of spaciong between elements**
+### 8. Distinct elements must have 2 pixels of spacing between each other.
 
 ![2px-element-spacing](images/2px-element-spacing.png?raw=true "2px-element-spacing")
 
@@ -53,7 +53,7 @@ Before an icon is added to the library, we like to have readable and optimized s
 
 ### Global Attributes
 
-For each icon these attributes are applied.
+For each icon these attributes are applied, corresponding to the above rules.
 
 ```xml
 <svg