Update files/en-us/web/svg/attribute/pointsatz/index.md

Co-authored-by: Joshua Chen <[email protected]>

files/en-us/web/svg/attribute/pointsatz/index.md

@@ -7,7 +7,7 @@ browser-compat: svg.elements.feSpotLight.pointsAtZ
 
 {{SVGRef}}
 
-The **`pointsAtZ`** attribute represents the Z location in the coordinate system established by attribute {{SVGAttr("primitiveUnits")}} on the {{SVGElement("filter")}} element of the point at which the light source is pointing, assuming that, in the initial local coordinate system, the positive z-axis comes out towards the person viewing the content and assuming that one unit along the z-axis equals one unit in x and y.
+The **`pointsAtZ`** attribute represents the z location in the coordinate system established by attribute {{SVGAttr("primitiveUnits")}} on the {{SVGElement("filter")}} element of the point at which the light source is pointing, assuming that, in the initial local coordinate system, the positive z-axis comes out towards the person viewing the content and assuming that one unit along the z-axis equals one unit in x and y.
 
 You can use this attribute with the following SVG elements: