Multi-line alias: only lines starting with "|" should be treated as values

[joegnis]

In the following code, Some should not be treated as a value. Instead, Value1, Value2, and so on should.

-- Bug
---@alias Alias
--- Some comment
--- | "Value1"
--- | "Value2"

In reality, Emmy thinks Alias is

(alias) Alias = Some
comment

which is wrong. Instead, it should be

(alias) Alias = ("Value1"|"Value2")
    | "Value1"
    | "Value2"

It looks like the issue only exists if there are comments before the first value. After I remove the comments before the first value, it is fine.

-- No bug
---@alias Alias
--- | "Value1"
--- Some comment
--- | "Value2"