public Builder extension(org.springdoc.core.fn.builders.extension.Builder extensionBuilder) {
		this.extensions = ArrayUtils.add(this.extensions, extensionBuilder.build());
		return this;
	}
Extension link builder.

@param extensionBuilder the extension builder
@return the link builder
springdoc-openapi-starter-common/src/main/java/org/springdoc/core/fn/builders/link/Builder.java