Update icon-design-guide.md (#2530)

docs/guide/design/icon-design-guide.md

@@ -52,7 +52,7 @@ Here are rules that should be followed to keep quality and consistency when maki
 
 ![optical-volume-high](../../images/optical-volume-high.svg?raw=true "optical-volume-high")
 
-**Tip:** place your icon next to circle or square and blur them both; your icon should not feel much darker than the base shape.
+**Tip:** place your icon next to the circle or square icon and blur them both; your icon should not feel much darker than the base shape.
 
 ### 10. Icons should be visually centered by their center of gravity.
 
@@ -76,7 +76,7 @@ Here are rules that should be followed to keep quality and consistency when maki
 
 ![curvature-uneven](../../images/curvature-uneven.svg?raw=true "curvature-uneven")
 
-**Tip:** make sure to use arcs or quadratic curves, when using cubic curves control points should have mirrored angles for smooth curves.
+**Tip:** make sure to use arcs or quadratic curves. When using cubic curves control points should have mirrored angles for smooth curves.
 
 ### 13. Icons should aim to be pixel perfect so that they will be sharp on low DPI displays.
 
@@ -142,7 +142,7 @@ For each icon these attributes are applied, corresponding to the above rules.
 ### Minify paths
 
 The code of paths can sometimes get quite large. To reduce file size we like to minify the code.
-We recommend to use the [SVGOMG](https://jakearchibald.github.io/svgomg/) to minify paths to 2 points of precision.
+We recommend to use [SVGOMG](https://jakearchibald.github.io/svgomg/) to minify paths to 2 points of precision.
 
 ### Allowed elements