@see annotation surrounds unknown symbols with tilde "~" (strikethrough)

### How are you using the lua-language-server?

Nvim

### Which OS are you using?

MacOS

### What is the issue affecting?

Hover

### Expected Behaviour

code should be able to use `@see` annotations that don't necessarily map to a known symbol.

### Actual Behaviour

unknown symbols are rendered as "strikethrough": https://github.com/LuaLS/lua-language-server/blob/8c32d8f95f28f8bc064533031898abfb7dea58b0/script/core/hover/description.lua#L144

### Reproduction steps

1. add a `@see bogus` annotation
2. hover the annotation in any LSP client

### Additional Notes

_No response_

### Log File

_No response_

Start at script/core/hover/description.lua around line 144, then reproduce the issue with an @see bogus annotation and hover it in an LSP client. Confirm the handling of an unresolved @see symbol and verify that the completed behavior no longer renders the unknown symbol with strikethrough.

Written by the indexing model from the issue text.