docs: point the XBlock Aside cross-references at real targets

[rawsun007]

Six cross-references on the two XBlock Aside pages render as plain text instead of links. xblock is in intersphinx_mapping, but these names are not in its inventory:

written	in the xblock inventory
:func: xblock.core.XBlockAside.aside_for	py:method — needs :meth:
xblock.scopes.ScopeIds	xblock.fields.ScopeIds
XBlockAside (3×)	xblock.core.XBlockAside
Fragment	web_fragments.fragment.Fragment

Each now uses the ~ form, so the displayed text is unchanged and only the link is added.

The normal build does not report these, because an unresolved Python-domain reference is only a warning under -n. With sphinx-build -n the tree goes from 8 warnings to 2, and the two left are graphviz not being installed on my machine. The built pages now carry the links, e.g. xblock.html#xblock.core.XBlockAside.

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