HISTORY: document @doc return value change in 1.13 (#61877)

[tejaswiverma121-byte]

Documents the breaking change to @doc's return value that was introduced in Julia 1.13 via #59882, as requested in #61877.

In Julia 1.12 and earlier, @doc returned a Docs.Binding object. In Julia 1.13, @doc instead returns the documented expression itself (e.g. a function or type). This change was intentional but was missing from the changelog.

Since 1.13 has already been released, this documents the change in HISTORY.md rather than NEWS.md. A companion PR (#<PR_NUMBER>) adds the equivalent entry to NEWS.md on the backports-release-1.13 branch.

Closes #61877

[tejaswiverma121-byte]

@lgoettgens is it okay this time ?

[lgoettgens]

Suggested change

	* The return value of `@doc` has changed: it now returns the documented
	expression (e.g. a function or type) instead of a `Docs.Binding` object
	as in previous versions. Code that depended on `@doc` returning a
	`Docs.Binding` will need to be updated ([#59882], [#60681]).
	* The return value of `@doc` has changed: it now returns the documented expression (e.g. a function or type) instead of a `Docs.Binding` object as in previous versions. Code that depended on `@doc` returning a `Docs.Binding` will need to be updated ([#59882], [#60681]).

this file seems to have arbitrarily long lines

[lgoettgens]

From a technical level, this looks fine (one comment above). I cannot judge the contents; you will have to wait for someone knowledgeable with the change for that.

A companion PR (#<PR_NUMBER>) adds the equivalent entry to NEWS.md on the backports-release-1.13 branch.

This is still missing

[tejaswiverma121-byte]

ohk i will look into it