docs: fix SQL syntax error, stale version references, and prose errors in misc files

[somethingwithproof]

Fix SQL syntax error in Boost.md: both ALTER TABLE statements had a trailing comma after the table name, breaking copy-paste.

Remove two stale MySQL settings from Requirements.md: table_cache (renamed to table_open_cache in MySQL 5.1.3) and innodb_file_io_threads (removed in MySQL 5.5, superseded by innodb_read/write_io_threads already documented in the same file).

Remove Debugging.md 'Miscellaneous' section referencing Cacti 0.8.6h and 'upcoming 0.9' (~18 years old); the issue it described was fixed before 1.0.

Fix prose errors in Boost.md, Principles-of-Operation.md, Contributing-Translations.md, and Standards-Security.md. See commit message for full list.

Update Cacti-SSL-Configuration.md: RSA key size 2048 -> 4096; fix 'HTTP' label in description text.

[Copilot]

Pull request overview

This documentation PR fixes a range of issues: a critical SQL syntax error (trailing comma on ALTER TABLE), stale MySQL variable references (table_cache renamed to table_open_cache, innodb_file_io_threads removal), removal of misleading pre-0.9 Cacti legacy content from Debugging.md, SSL certificate improvements (RSA key size 2048→4096 bits), and dozens of prose/spelling corrections across many files. It also adds several new files (new template docs, conversion guide, scripts) and modernizes existing shell scripts.

Changes:

• Fix SQL syntax, remove stale MySQL variables, and remove misleading legacy debug section in Requirements.md and Debugging.md
• SSL config update: RSA key 4096 bits, HTTP→HTTPS comment, Let's Encrypt recommendation
• Widespread prose/spelling fixes, copyright year updates (2022→2026), and new documentation files

Reviewed changes

Copilot reviewed 129 out of 152 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
Requirements.md	table_cache → table_open_cache (with note); innodb_file_io_threads removed
Debugging.md	Stale Cacti 0.8.6h "poller_output" section removed
Cacti-SSL-Configuration.md	Key size 2048→4096, "HTTP"→"HTTPS" label, Let's Encrypt note added
Standards-Security.md	OS command injection section added; "the the" and "invalidate" fixed
Principles-of-Operation.md	Multiple prose fixes (principle→principles, resiliant→resilient, etc.)
Contributing-Translations.md	"sigining up" → "signing up"
template_apache_config.md	New file — Apache template config for CentOS and Debian
template_esxi_config.md	New file — ESXi SNMP configuration guide
supported-plugins.md	New file — list of Cacti Group–supported plugins
device-template-specific-proxmox.md	New file — Proxmox external storage guide
convert-from-package-to-source-debian-ubuntu.md	New file — package-to-source migration guide
bin/copyright_year.sh	New utility to bulk-update copyright years
bin/check_missing_link.sh, bin/check_markdown_style.sh, bin/build_html_docs.sh	Shell script modernization (backtick→$(), quoting)
resource/xml/query_interface_traffic.php	License header added, trailing whitespace removed
resources/unused_images.sh	Modernized (grep -c, $(…))
.travis.yml	Removed (CI migration)
~60 other .md files	Copyright year 2022→2026; whitespace/formatting cleanup

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[Copilot]

Typo: "tge" should be "the" in the sentence "You can use ESXCLI commands directly on tge host using the ESXi Shell".

[Copilot]

Two spelling errors in the Debian section of this new file: "apcache2" (line 29) should be "apache2", and "stauts" (line 43) should be "status".