[lld] [LLD] [Docs] explain --unresolved-symbols options (PR #165937)

[Fangrui Song via llvm-commits]

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@@ -719,6 +719,21 @@ a given pattern are handled as if they were given as arguments of
 Creates a separate output section for every orphan input section.
 .It Fl -unresolved-symbols Ns = Ns Ar value
 Determine how to handle unresolved symbols.
+.Ar value
+may be:
+.Pp
+.Bl -tag -width 2n -compact
+.It Cm report-all
+Report unresolved symbols (default).
+.It Cm ignore-in-object-files
+Only report unresolved symbols contained in shared libraries. Ignore if the are
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MaskRay wrote:

typo: they/they

Actually, suggest "Report unresolved symbols from shared libraries." and omit "Ignore ..."

https://github.com/llvm/llvm-project/pull/165937