bug in simple doc or during creation of a method

Nobody has claimed this yet.

The following code (note the return type is `ideal`, not `Ideal`!) gives an error during `installPackage`. Removing the doc node, or changing the return type to `Ideal` both work correctly. Perhaps when creating a method, we should make sure the suggested return type is a type?

```
-- DocBug.m2
newPackage(
"DocBug",
Version => "0.1",
Date => "8 June 2023",
Headline => "bug in Core",
AuxiliaryFiles => false,
DebuggingMode => true
)

export {"myfun"}

myfun = method()
myfun(ZZ) := ideal => n -> (
ideal 0_ZZ
)

beginDocumentation()

doc ///
Key
(myfun, ZZ)
Headline
compute
Usage
myfun n
///

end--

-* Development section *-
restart
debug needsPackage "DocBug"
check "DocBug"

uninstallPackage "DocBug"
restart
installPackage "DocBug"
viewHelp "DocBug"
```

Reproduce the failure using the DocBug.m2 example, focusing on installPackage and the documented myfun method with return type ideal. Trace how method creation and the doc node process the suggested return type; done means the package installs successfully and viewHelp works without changing ideal to Ideal or removing the documentation.

Written by the indexing model from the issue text.