Same entity always returned by readFragment

[GulajavaMinistudio]

…ts (angular#11535)

• improve basic demo and md-chip-remove directive docs
• no longer parse JSON object
  in order to try to provide some useful identifier in messages

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What kind of change does this PR introduce?

[ ] Bugfix
[ ] Enhancement
[ ] Documentation content changes
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
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[ ] CI related changes
[ ] Infrastructure changes
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Does this PR introduce a breaking change?

[ ] Yes
[ ] No

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