Fix typo, url error and outdated command description of doc clients.

[yangyanqing]

• Targeted PR against correct branch (see CONTRIBUTING.md)

• Linked to github-issue with discussion and accepted design OR link to spec that describes this work.

• Wrote tests

• Updated relevant documentation (docs/)

• Added a relevant changelog entry: sdkch add [section] [stanza] [message]

• rereviewed Files changed in the github PR explorer

---

For Admin Use:

• Added appropriate labels to PR (ex. wip, ready-for-review, docs)
• Reviewers Assigned
• Squashed all commits, uses message "Merge pull request #XYZ: [title]" (coding standards)

[codecov]

Codecov Report

Merging #4123 into develop will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop    #4123   +/-   ##
========================================
  Coverage    60.08%   60.08%           
========================================
  Files          211      211           
  Lines        15134    15134           
========================================
  Hits          9093     9093           
  Misses        5419     5419           
  Partials       622      622

[codecov]

Codecov Report

Merging #4123 into develop will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop    #4123   +/-   ##
========================================
  Coverage    60.08%   60.08%           
========================================
  Files          211      211           
  Lines        15134    15134           
========================================
  Hits          9093     9093           
  Misses        5419     5419           
  Partials       622      622