doc(k8s): add building note for missing classes

[conghuhu]

Purpose of the PR

• fix: [Question] Can't find org.apache.hugegraph.computer.k8s.crd.model.EventType #253

Main Changes

Verifying these changes

• This change is a trivial rework / code cleanup without any test coverage.

(or)

• This change is already covered by existing tests, such as (please describe tests).

(or)

• This change added tests and can be verified as follows:

  (for example:)

  • Add UT.

Does this PR potentially affect the following parts?

• Nope
• Dependencies (add/update license info)
• Modify configurations
• The public API
• Other affects (typed here)

Documentation Status

• Doc - TODO
• Doc - Done
• Doc - NO Need

[conghuhu]

@imbajin PTAL

[imbajin]

Thanks, could also add it in computer-doc

[conghuhu]

computer-doc
Okay

[codecov]

Codecov Report

Merging #254 (5c68bb1) into master (7df3b43) will decrease coverage by 0.01%.
The diff coverage is 50.00%.

@@ Coverage Diff @@ ## master #254 +/- ## ============================================ - Coverage 85.79% 85.78% -0.01%  + Complexity 3238 3233 -5  ============================================ Files 344 344 Lines 12105 12115 +10 Branches 1090 1092 +2 ============================================ + Hits 10385 10393 +8  - Misses 1194 1198 +4  + Partials 526 524 -2 

Impacted Files	Coverage Δ
...graph/computer/core/sender/MessageSendBuffers.java	86.36% <33.33%> (-8.38%)	⬇️
...graph/computer/core/sender/MessageSendManager.java	78.40% <100.00%> (ø)

... and 9 files with indirect coverage changes

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