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Follow go style guide and fix versioning doc link
Signed-off-by: sakeven <jc5930@sina.cn>
**What this PR does / why we need it**:
1. Follow go style guide
* should drop = "" from declaration of var gitMajor; it is the zero value
* should omit type string from declaration of var gitVersion; it will be inferred from the right-hand side
2. Fix versioning doc link.
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #
**Special notes for your reviewer**:
**Release note**:
```
NONE
```
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