docs: fix drifted anchors to existing pages in openvox 8x (#262 F)

[miharp]

What

Fixes links whose target page exists but whose #fragment drifted — workstream F of #262. Each new anchor was verified against the built page's actual kramdown id (htmlproofer … --checks Links).

Anchor renames (link → current id)

Target page	Old	New
lang_relationships	#chaining-arrows / #relationship-metaparameters	#syntax-chaining-arrows / #syntax-relationship-metaparameters
lang_facts_and_builtin_vars	#serverfacts-variable / #the-factsfactname-hash	#server_facts-variable / #the-factsfact_name-hash
modules_fundamentals	#files	#files-in-modules
function	#asserttype	#assert_type
install_windows	#puppetagentaccountuser	#puppet_agent_account_user
config_about_settings	#settings-can-be-set-on-the-command-line	#settings-on-the-command-line
architecture	#note-differences-between-agentmaster-and-puppet-apply	#differences-between-agent-server-and-stand-alone
style_guide	#module-documentation	#documentation
modules_metadata	…requirements-in-module	…requirements-in-modules
modules_installing	#installing-modules	#installing-modules-from-the-command-line
quick_start_firewall	…myfirewall…	…my_firewall…

Plus two repoints where the original section was removed/restructured:

• ssl_attributes_extensions → subsystem_agent_server_comm.html#check-for-keys-and-certificates repointed to the page's current section id (page rewritten in fix: rename agent/master comm doc to agent/server, modernize content and diagram #256).
• config_important_settings → the static-compiler link repointed from the removed indirection.html#staticcompiler-terminus to the static_catalogs page (its modern home).

lang_expressions operator headings

The comparison/arithmetic/hash operator headings start with a code span (e.g. ### \==` (equality)), so kramdown auto-generated **leading-hyphen ids** (-equality, --subtraction-and-negation, -splat, …) that the clean-form inbound links never matched. Added explicit {#equality}, {#regex-or-data-type-match}, {#subtraction-and-negation}, {#splat}, {#merging}` so the links resolve and the anchors are stable.

Verification

htmlproofer _site/openvox/latest --disable-external --checks Links: all F-scope anchor failures resolved. jekyll build clean. Diff is anchor-only (16 files, 25/25 lines).

Out of scope (remaining hash failures, for E / content cleanup)

• Moved core types — type.html#cron / #host / #mount / #scheduledtask + the cron-attribute-* family (now in the puppetlabs-*_core modules, not core type.html).
• Removed settings — configuration.html#ca / #ordering / #capass / etc.
• The removed LDAP node terminus (indirection.html#ldap-terminus).
• Two cross-collection openvox-server anchors.

Part of #262