Add clarification points to using SCP style URIs

This addresses user-facing documentation related to repository
mirroring.

On the repositoring mirroring view of repository settings, inputting
either git@example.com:group/project.git or any variation of schemes:

* https://git@example.com:group/project.git
* http://git@example.com:group/project.git
* git://git@example.com:group/project.git
* ssh://git@example.com:group/project.git

Fails on URL validation.

This commit adds notes about the required format to the doc and view for
repository mirroring. This commit does not attempt to validate the URL.

see #47544
89 jobs for clarify-git-scp-style in 41 minutes and 39 seconds (queued for 4 seconds)
latest
Status Job ID Name Coverage
  Prepare
passed #87910612
gitlab-org
compile-assets

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passed #87910611
gitlab-org
retrieve-tests-metadata

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gitlab-org
setup-test-env

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  Test
passed #87910690
allowed to fail
codequality

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gitlab-org
db:check-schema-pg

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gitlab-org
db:migrate:reset-mysql

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db:migrate:reset-pg

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db:rollback-mysql

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db:rollback-pg

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allowed to fail
dependency_scanning

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docs lint

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gitlab-org
downtime_check

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ee_compat_check

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passed #87910688
gitlab-org
gitlab:assets:compile

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gitlab-org
gitlab:setup-mysql

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passed #87910686
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gitlab:setup-pg

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gitlab_git_test

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passed #87910689
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karma

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57.02%
passed #87910683
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migration:path-mysql

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migration:path-pg

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qa:internal

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passed #87910694
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qa:selectors

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passed #87910677
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rails5_gemfile_lock_check

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rspec-mysql 0 30

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gitlab-org
rspec-mysql 8 30

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rspec-mysql 9 30

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passed #87910614
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rspec-pg 0 30

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rspec-pg 9 30

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passed #87910691
allowed to fail
sast

00:03:42

passed #87910674
gitlab-org
static-analysis

00:19:04

 
  Post Test
skipped #87910697
gitlab-org
coverage
skipped #87910696
gitlab-org allowed to fail
flaky-examples-check
skipped #87910698
gitlab-org
lint:javascript:report
 
  Post Cleanup
skipped #87910699
gitlab-org allowed to fail manual
review-docs-cleanup
 
Name Stage Failure
failed
ee_compat_check Test
    

Running after script...
$ date
Thu Aug 9 03:00:01 UTC 2018
Uploading artifacts...
ee_compat_check/patches/*.patch: found 1 matching files
Uploading artifacts to coordinator... ok id=87910678 responseStatus=201 Created token=-hKDfWtc
ERROR: Job failed: exit code 1