Fix accordion gradient background. (WordPress#71802)

Co-authored-by: levinbaria <levinbaria@git.wordpress.org>
Co-authored-by: t-hamano <wildworks@git.wordpress.org>

Author: 3 people

docs/reference-guides/core-blocks.md

@@ -16,7 +16,7 @@ Displays a group of accordion headers and associated expandable content. ([Sourc
 -	**Experimental:** true
 -	**Category:** design
 -	**Allowed Blocks:** core/accordion-content
--	**Supports:** align (full, wide), background (backgroundImage, backgroundSize), color (background, gradient, text), interactivity, layout, shadow, spacing (blockGap, margin, padding), ~~html~~
+-	**Supports:** align (full, wide), background (backgroundImage, backgroundSize), color (background, gradients, text), interactivity, layout, shadow, spacing (blockGap, margin, padding), ~~html~~
 -	**Attributes:** autoclose, iconPosition, showIcon
 
 ## Accordion Content
@@ -28,7 +28,7 @@ Displays a section of content in an accordion, including a header and expandable
 -	**Category:** design
 -	**Parent:** core/accordion
 -	**Allowed Blocks:** core/accordion-header, core/accordion-panel
--	**Supports:** color (background, gradient, text), interactivity, layout, shadow, spacing (blockGap, margin)
+-	**Supports:** color (background, gradients, text), interactivity, layout, shadow, spacing (blockGap, margin)
 -	**Attributes:** openByDefault
 
 ## Accordion Header
@@ -39,7 +39,7 @@ Displays an accordion header. ([Source](https://github.com/WordPress/gutenberg/t
 -	**Experimental:** true
 -	**Category:** design
 -	**Parent:** core/accordion-content
--	**Supports:** anchor, color (background, gradient, text), interactivity, shadow, spacing (margin, padding), typography (fontSize, textAlign), ~~align~~
+-	**Supports:** anchor, color (background, gradients, text), interactivity, shadow, spacing (margin, padding), typography (fontSize, textAlign), ~~align~~
 -	**Attributes:** iconPosition, level, levelOptions, openByDefault, showIcon, textAlignment, title
 
 ## Accordion Panel
@@ -50,7 +50,7 @@ Displays an accordion panel. ([Source](https://github.com/WordPress/gutenberg/tr
 -	**Experimental:** true
 -	**Category:** design
 -	**Parent:** core/accordion-content
--	**Supports:** color (background, gradient, text), interactivity, layout, shadow, spacing (blockGap, margin, padding), typography (fontSize, lineHeight)
+-	**Supports:** color (background, gradients, text), interactivity, layout, shadow, spacing (blockGap, margin, padding), typography (fontSize, lineHeight)
 -	**Attributes:** allowedBlocks, isSelected, openByDefault, templateLock
 
 ## Archives

packages/block-library/src/accordion-content/block.json

@@ -11,7 +11,7 @@
 	"supports": {
 		"color": {
 			"background": true,
-			"gradient": true
+			"gradients": true
 		},
 		"interactivity": true,
 		"spacing": {

packages/block-library/src/accordion-header/block.json

@@ -15,7 +15,7 @@
 		"anchor": true,
 		"color": {
 			"background": true,
-			"gradient": true
+			"gradients": true
 		},
 		"align": false,
 		"interactivity": true,

packages/block-library/src/accordion-panel/block.json

@@ -10,7 +10,7 @@
 	"supports": {
 		"color": {
 			"background": true,
-			"gradient": true
+			"gradients": true
 		},
 		"interactivity": true,
 		"spacing": {

packages/block-library/src/accordion/block.json

@@ -19,7 +19,7 @@
 		},
 		"color": {
 			"background": true,
-			"gradient": true
+			"gradients": true
 		},
 		"__experimentalBorder": {
 			"color": true,