Fix copy-paste doc errors in icephys, image, misc, and ophys schemas

[ehennestad]

Summary of changes

• nwb.icephys.yaml: VoltageClampSeries.capacitance_slow unit attribute doc incorrectly referenced capacitance_fast; corrected to capacitance_slow.
• nwb.misc.yaml: IntervalSeries.data resolution and unit attribute docs were verbatim copy-paste from AnnotationSeries ("Annotations have no units…"); updated to accurately describe IntervalSeries integer marker semantics.
• nwb.image.yaml: IndexSeries.indexed_images link doc referenced the non-existent dataset name 'ordered_images'; corrected to 'order_of_images' to match the actual field defined in nwb.base.yaml.
• nwb.ophys.yaml: ImagingPlane.device link doc said "record from this electrode", which is domain-incorrect for an optical physiology type; updated to reference imaging/microscope context.
• Version bumped to 2.10.1-alpha and release notes updated.

All changes are documentation-only (doc: strings and release notes).

Checklist

For all schema changes:

• Add release notes for the PR to docs/format/source/format_release_notes.rst.
• Have you included the relevant issue number using "Fix #XXX" notation where XXX is the issue number? By including "Fix #XXX" you allow GitHub to close issue #XXX when the PR is merged.
• Make sure that hdmf-common-schema points to the latest release and not the latest commit on the main branch.

If this is the first schema change after a schema release (i.e., the version string in core/nwb.namespace.yaml does not
end in "-alpha"), then:

• Update the version string in core/nwb.namespace.yaml and core/nwb.file.yaml to the next major/minor/patch version with the suffix "-alpha". (bumped to 2.10.1-alpha)
• Update the value of the version variable in docs/format/source/conf.py to the next version without the suffix "-alpha" (2.10.1).
• Update the value of the release variable in docs/format/source/conf.py to the next version with the suffix "-alpha" (2.10.1-alpha).
• Add a new section in the release notes docs/format/source/format_release_notes.rst for the new version with the date "Upcoming" in parentheses.