fix: correct the code blocks documentation

[noahingh]

Summary

I've made two corrections to the code blocks document.

1. Put the codeBlock field under the blockSpecs field because it's not a root field.
2. The dark and light theme is not supported in shiki.

BlockNote/packages/core/src/schema/schema.ts

Lines 174 to 227 in f150e1e

	public extend<
	AdditionalBlockSpecs extends BlockSpecs = Record<string, never>,
	AdditionalInlineContentSpecs extends Record<
	string,
	InlineContentSpec<InlineContentConfig>
	> = Record<string, never>,
	AdditionalStyleSpecs extends StyleSpecs = Record<string, never>,
	>(opts: {
	blockSpecs?: AdditionalBlockSpecs;
	inlineContentSpecs?: AdditionalInlineContentSpecs;
	styleSpecs?: AdditionalStyleSpecs;
	}): CustomBlockNoteSchema<
	AdditionalBlockSpecs extends undefined | Record<string, never>
	? BSchema
	: BSchema & {
	[K in keyof AdditionalBlockSpecs]: K extends string
	? AdditionalBlockSpecs[K]["config"]
	: never;
	},
	AdditionalInlineContentSpecs extends undefined | Record<string, never>
	? ISchema
	: ISchema & {
	[K in keyof AdditionalInlineContentSpecs]: AdditionalInlineContentSpecs[K]["config"];
	},
	AdditionalStyleSpecs extends undefined | Record<string, never>
	? SSchema
	: SSchema & {
	[K in keyof AdditionalStyleSpecs]: AdditionalStyleSpecs[K]["config"];
	}
	> {
	// Merge the new specs with existing ones
	Object.assign(this.opts.blockSpecs, opts.blockSpecs);
	Object.assign(this.opts.inlineContentSpecs, opts.inlineContentSpecs);
	Object.assign(this.opts.styleSpecs, opts.styleSpecs);
	// Reinitialize the block specs with the merged specs
	const {
	blockSpecs,
	inlineContentSpecs,
	styleSpecs,
	blockSchema,
	inlineContentSchema,
	styleSchema,
	} = this.init();
	this.blockSpecs = blockSpecs;
	this.styleSpecs = styleSpecs;
	this.styleSchema = styleSchema;
	this.inlineContentSpecs = inlineContentSpecs;
	this.blockSchema = blockSchema;
	this.inlineContentSchema = inlineContentSchema;
	return this as any;
	}
	}

[vercel]

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