docs(crypto/gsha256): fix comment capitalization to match package style

[Copilot]

Updates #4558

Function comments in gsha256 used lowercase "sha256 algorithms" while sibling packages gsha1 and gmd5 use uppercase "SHA1 algorithms" and "MD5 algorithms".

Changes:

• Capitalized "SHA256" in all function comments (Encrypt, EncryptFile, MustEncryptFile)

This maintains consistency with the existing documentation style across crypto packages.

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[Copilot]

Just as a heads up, I was blocked by some firewall rules while working on your feedback. Expand below for details.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• aead.dev
  • Triggering command: /update-job-proxy /update-job-proxy (dns block)
  • Triggering command: /update-job-proxy /update-job-proxy conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT basename /home/dependabot/bin/git uoVadis_Root_CA_runc %H %ct %D 66214afc9cc347c9/var/run/docker/runtime-runc/moby git -c protocol.version--log-format fetch /bin/git --depth=1 origin refs/tags/v1.0.1-t /usr/lib/git-corfilter (dns block)
• go.googlesource.com
  • Triggering command: /update-job-proxy /update-job-proxy (dns block)
  • Triggering command: /update-job-proxy /update-job-proxy conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT basename /home/dependabot/bin/git uoVadis_Root_CA_runc %H %ct %D 66214afc9cc347c9/var/run/docker/runtime-runc/moby git -c protocol.version--log-format fetch /bin/git --depth=1 origin refs/tags/v1.0.1-t /usr/lib/git-corfilter (dns block)
• go.opentelemetry.io
  • Triggering command: /update-job-proxy /update-job-proxy (dns block)
  • Triggering command: /update-job-proxy /update-job-proxy conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT basename /home/dependabot/bin/git uoVadis_Root_CA_runc %H %ct %D 66214afc9cc347c9/var/run/docker/runtime-runc/moby git -c protocol.version--log-format fetch /bin/git --depth=1 origin refs/tags/v1.0.1-t /usr/lib/git-corfilter (dns block)
• google.golang.org
  • Triggering command: /update-job-proxy /update-job-proxy (dns block)
  • Triggering command: /update-job-proxy /update-job-proxy conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT basename /home/dependabot/bin/git uoVadis_Root_CA_runc %H %ct %D 66214afc9cc347c9/var/run/docker/runtime-runc/moby git -c protocol.version--log-format fetch /bin/git --depth=1 origin refs/tags/v1.0.1-t /usr/lib/git-corfilter (dns block)
• gopkg.in
  • Triggering command: /update-job-proxy /update-job-proxy (dns block)
  • Triggering command: /update-job-proxy /update-job-proxy conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT basename /home/dependabot/bin/git uoVadis_Root_CA_runc %H %ct %D 66214afc9cc347c9/var/run/docker/runtime-runc/moby git -c protocol.version--log-format fetch /bin/git --depth=1 origin refs/tags/v1.0.1-t /usr/lib/git-corfilter (dns block)
• modernc.org
  • Triggering command: /update-job-proxy /update-job-proxy (dns block)
  • Triggering command: /update-job-proxy /update-job-proxy conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT basename /home/dependabot/bin/git uoVadis_Root_CA_runc %H %ct %D 66214afc9cc347c9/var/run/docker/runtime-runc/moby git -c protocol.version--log-format fetch /bin/git --depth=1 origin refs/tags/v1.0.1-t /usr/lib/git-corfilter (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)