Fix factual and code errors surfaced by a full-repo proofread

[alexander-yevsyukov]

What

Seven factual/code corrections to the documentation, surfaced by a full-repo prose proofread but out of that proofread's (prose-only) scope. Each is a one-line fix, spread across five files.

File	Fix
docs/_code/samples/…/spine/site/home/events.proto	java_outer_classname "CommandsProto" → "EventsProto" — a copy-paste slip from commands.proto that compiled only because java_package differs
docs/content/docs/guides/gradle.md	implemetation → implementation, and :model-users → :users-model to match the surrounding users-model/trains-model/billing-model prose convention
docs/content/docs/introduction/naming-conventions.md	events sub-package entity → event; BoundedContext factory-class Context "prefix" → "suffix"; missing ; after ProjectId project = 2 in the TaskProjection snippet
EMBEDDING.md	chmod-instruction directory _code → docs/_bin, where the executable is actually placed
docs/content/docs/resources/people.md	Domain-Driven Design subtitle → "Tackling Complexity in the Heart of Software" (matches books.md)

Why

Each is an inaccuracy a reader would trip on: a mislabeled generated Java class, an uncompilable Gradle snippet (typo) with an inverted module name, two wrong words in the naming guide, a proto snippet missing a statement terminator, a troubleshooting step pointing at the wrong directory, and a misquoted book title.

Verification

• Proto change compiled independently. All three sample protos (identifiers / commands / events) were run through a standalone protoc; it generates event/EventsProto.java alongside command/CommandsProto.java with no outer-class name collision.
• review-docs reviewed the diff against Spine documentation conventions → APPROVE, no Must-fix / Should-fix.
• No links were added or modified, so check-links is not needed for this change.
• git grep confirms no other occurrence of any of these mistakes remains.

The repo's own ./gradlew :buildAll / checkSamples were not run here for pre-existing, unrelated reasons: the docs/_code/samples build is broken on Apple Silicon (protoc 3.13.0 has no osx-aarch_64 binary; dead JCenter), and checkSamples is currently vacuous (its config points at a docs/content/docs/1 path that no longer exists, and the tool's arg error does not fail the task). Both are being addressed on separate branches.

Notes for the reviewer

• The events.proto diff also carries a copyright-header refresh (year 2020 → 2026, license URL → https) applied automatically by the repo's update-copyright hook when the file was edited.
• gradlew.bat on this branch shows unrelated, pre-existing line-ending churn; it is intentionally excluded from this commit.

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