Fix remaining RST escape artifacts and grammar issues

[dereuromark]

Summary

Fixes remaining RST-to-Markdown conversion escape artifacts and grammar issues found during a deeper review.

RST escape artifacts (10 files):

Replaced RST-style escaped syntax (\$var, \<tag\>, \[\], =\>) with proper markdown inline code across:

• views/helpers/text.md — \$text, \<p\>, \<br\>
• views/helpers/html.md — \$attributes, \$options, \<table\>, \<tr\>, \<td\>, \[\]
• views/helpers/paginator.md — \<div\>...\</div\>
• development/debugging.md — \$path, \$line, \$context
• controllers/request-response.md — \$_SERVER, \$_ENV in heading
• core-libraries/logging.md — \$level.log, \$name, \$config
• core-libraries/number.md — \$currency in table header
• core-libraries/caching.md — =\>, \$value
• plugins.md — \[Plugin\]/\[Controller\]/\[view\]
• contributing/tickets.md — \[at\]
• development/errors.md — \_ prefix

Grammar fixes (3 files):

• console-commands/completion.md — the same way than → the same way as
• console-commands/commands.md — Lets call → Let's call
• development/errors.md — missing space after dash in list item