doc: add missing doc for sector.cornerRadius

Author: Ovilia

en/option/partial/zr-graphic.md

@@ -626,6 +626,16 @@ Sector element.
     symbolDeclare = ${symbolDeclare}
 ) }}
 
+###${prefix} cornerRadius(number|Array)
+
+{{ use: partial-version(version = "5.3.0") }}
+
+The corner radius of the sector.
+
++ `cornerRadius: 10`: Indicates that both the inner and outer corner radii are 10px.
++ `cornerRadius: [10, 20]`: When applied to a ring chart, the inner corner radius is 10px and the outer corner radius is 20px.
++ `cornerRadius: [5, 10, 15, 20]`: Indicates that the inner corner radii are 5px and 10px, and the outer corner radii are 15px and 20px.
+
 {{ use: partial-graphic-cpt-sub-prop-angle(
     prefix = ${prefix},
     optionPath = ${optionPath},

zh/option/partial/zr-graphic.md

@@ -627,6 +627,16 @@ font: 'bolder 2em "Microsoft YaHei", sans-serif'
     symbolDeclare = ${symbolDeclare}
 ) }}
 
+###${prefix} cornerRadius(number|Array)
+
+{{ use: partial-version(version = "5.3.0") }}
+
+扇形的圆角。
+
++ `cornerRadius: 10`：表示内圆角半径和外圆角半径都是 `10px`。
++ `cornerRadius: [10, 20]`：表示为环形图时，内圆角半径是 `10px`、外圆角半径是 `20px`。
++ `cornerRadius: [5, 10, 15, 20]`：表示内圆角半径分别为 `5px` 和 `10px`，外圆角半径分别为 `15px` 和 `20px`。
+
 {{ use: partial-graphic-cpt-sub-prop-angle(
     prefix = ${prefix},
     optionPath = ${optionPath},