Updated Hover ideas (markdown)

Hover-ideas.md

@@ -5,3 +5,13 @@ Info we may want to include (in API and/or UI):
 - type (actual type, not as-written. questionably useful for functions, what does it even mean for types/templates/...)
 - definition (e.g. initializer and spelled type for variables. declaration only for functions. Lambda captures/parameters?)
 - documentation
+
+Possible layout
+***
+SymbolCollector::**initialize**<br>
+member function in namespace `clang::clangd`<br>
+```
+void SymbolCollector::initialize(ASTContext &Ctx) override;
+```
+This is where we'd put a documentation comment, if we had one!
+***