Fix warning in rustdoc job (#8159)

* Fix warning in rustdoc job

* More fixes

* Remove `build-rust-doc` job

Remove this job until upstream is fixed:
https://github.com/rust-lang/rust/issues/82284

* CI: temp. remove of the publishing job, no use of it w/o build

Co-authored-by: Denis P <denis.pisarev@parity.io>

substrate/.gitlab-ci.yml

@@ -463,30 +463,6 @@ build-macos-subkey:
   tags:
     - osx
 
-build-rust-doc:
-  stage:                           build
-  <<:                              *docker-env
-  <<:                              *test-refs
-  needs:
-    - job:                         test-linux-stable
-      artifacts:                   false
-  variables:
-    <<:                            *default-vars
-    RUSTFLAGS:                     -Dwarnings
-  artifacts:
-    name:                          "${CI_JOB_NAME}_${CI_COMMIT_REF_NAME}-doc"
-    when:                          on_success
-    expire_in:                     7 days
-    paths:
-    - ./crate-docs/
-  script:
-    - rm -f ./crate-docs/index.html # use it as an indicator if the job succeeds
-    - SKIP_WASM_BUILD=1 RUSTDOCFLAGS="--html-in-header $(pwd)/.maintain/rustdoc-header.html"
-        time cargo +nightly doc --no-deps --workspace --all-features --verbose
-    - mv ./target/doc ./crate-docs
-    - echo "<meta http-equiv=refresh content=0;url=sc_service/index.html>" > ./crate-docs/index.html
-    - sccache -s
-
 #### stage:                        publish
 
 .build-push-docker-image:          &build-push-docker-image
@@ -567,32 +543,6 @@ publish-s3-release:
     - aws s3 ls s3://${BUCKET}/${PREFIX}/latest/
         --recursive --human-readable --summarize
 
-publish-s3-doc:
-  stage:                           publish
-  image:                           paritytech/awscli:latest
-  allow_failure:                   true
-  needs:
-    - job:                         build-rust-doc
-      artifacts:                   true
-    - job:                         build-linux-substrate
-      artifacts:                   false
-  <<:                              *build-refs
-  <<:                              *kubernetes-build
-  variables:
-    GIT_STRATEGY:                  none
-    BUCKET:                        "releases.parity.io"
-    PREFIX:                        "substrate-rustdoc"
-  script:
-    - test -r ./crate-docs/index.html || (
-        echo "./crate-docs/index.html not present, build:rust:doc:release job not complete";
-        exit 1
-      )
-    - aws s3 sync --delete --size-only --only-show-errors
-        ./crate-docs/ s3://${BUCKET}/${PREFIX}/
-  after_script:
-    - aws s3 ls s3://${BUCKET}/${PREFIX}/
-        --human-readable --summarize
-
 publish-draft-release:
   stage:                           publish
   image:                           paritytech/tools:latest