fix: link to docs on the monitor tab

[FloydJohn]

Which problem is this PR solving?

Resolves #928

Short description of the changes

• This commit fixes a broken link on the empty state banner of the monitor page.

[albertteoh]

Thanks @FloydJohn; can you please update the test as well?

$ yarn coverage
...
Summary of all failing tests
 FAIL  src/components/Monitor/ServicesView/index.test.js
  ● <MonitorATMServicesView> › ATM snapshot test with no metrics

    expect(value).toMatchSnapshot()

    Received value does not match stored snapshot "<MonitorATMServicesView> ATM snapshot test with no metrics 1".

    - Snapshot
    + Received

    @@ -4,11 +4,15 @@
            <React.Fragment>
              No data yet! Please see these
              <Link
                replace={false}
                target="_blank"
    -           to="//https://www.jaegertracing.io/docs/latest/spm/"
    +           to={
    +             Object {
    +               "pathname": "https://www.jaegertracing.io/docs/latest/spm/",
    +             }
    +           }

[FloydJohn]

Done!

[codecov]

Codecov Report

Merging #929 (12c2ea0) into main (53da5e6) will increase coverage by 0.06%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #929      +/-   ##
==========================================
+ Coverage   95.25%   95.32%   +0.06%     
==========================================
  Files         240      240              
  Lines        7510     7510              
  Branches     1883     1883              
==========================================
+ Hits         7154     7159       +5     
+ Misses        350      345       -5     
  Partials        6        6              

Impacted Files	Coverage Δ
...r-ui/src/components/Monitor/ServicesView/index.tsx	97.05% <ø> (ø)
...mponents/TracePage/TraceStatistics/tableValues.tsx	95.51% <0.00%> (+1.72%)	⬆️

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