fix(content/document): let `roots` as rest parameters of read

[yin1999]

Summary

Fixes: #7196.

Problem

~It seems that the findByURL doesn't pass roots as a string array. Just fix this.~ refeactor the read function: pass roots as rest parameters.

And for the remove function, we can search with the specific root (not both en-us and l10n). And we can throw error when the locale is not specified (or not exists).

Solution

Minor fixes.

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Screenshots

Before

for en-US (yarn tool delete Web/API/ShadowRoot/onslotchange --redirect=Web/API/HTMLSlotElement/slotchange_event)

for fr (yarn tool delete conflicting/Glossary/Firefox_OS fr --redirect Glossary/Boot2Gecko)

After

for en-US:

for fr:

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How did you test this change?

run yarn tool delete

[SphinxKnight]

is there something blocking this one? using the command is almost a mandatory step to deal with sync translated content PRs