Be confused to Backticks

Issue Description

I noticed two examples about backticks.
The first is in @generic Capture with Backticks

---@class Vehicle
local Vehicle = {}
function Vehicle:drive() end

---@generic T
---@param class `T` # the type is captured using `T`
---@return T       # generic type is returned
local function new(class) end

-- obj: Vehicle
local obj = new("Vehicle")

The second is in @param Generic Function Parameter

---@class Box

---@generic T
---@param objectID integer The ID of the object to set the type of
---@param type `T` The type of object to set
---@return `T` object The object as a Lua object
local function setObjectType(objectID, type) end

--> boxObject: Box
local boxObject = setObjectType(1, "Box")

Are there any differences between them?

---@return T
---@return `T`

Additional Notes

BTW, how can I annotate this:

---@class X
---@field A integer
---@field B string
---@field C boolean[]

---@param x X
---@param key string
---@return ?
function getter(x, key)
    return x[key]
end

Is it possible to use backticks?

该 issue 没有指出任何仓库文件、测试或入口点。先比较文档中用反引号标出的两个示例和 getter 注解，然后确定文档是否清楚定义了它们的含义以及动态字段访问所需的注解；当差异和受支持的语法已记录在文档中，或该 issue 已通过具体的文档修改得到解决时，即视为完成。