Add some potentially helpful file information to unexpected interpolation problems in markdown

Author: aaruni96

src/html/HTMLWriter.jl

@@ -2443,7 +2443,8 @@ function domify(dctx::DCtx, ::Node, e::MarkdownAST.JuliaValue)
 
         To write the dollar sign, escape it with `\\\$`
 
-        We don't have the file or line number available, but we got given the value:
+        Navnode is currently set to $(dctx.navnode.page), with parent $(dctx.navnode.parent), and we
+        got given the value:
 
         `$(e.ref)` which is of type `$(typeof(e.ref))`
     """

src/latex/LaTeXWriter.jl

@@ -856,7 +856,7 @@ function latex(io::Context, node::Node, value::MarkdownAST.JuliaValue)
 
     To write the dollar sign, escape it with `\\\$`
 
-    We don't have the file or line number available, but we got given the value:
+    We have the file name $(io.filename), and we got given the value:
 
     `$(value.ref)` which is of type `$(typeof(value.ref))`
     """