[docs] Exclude quickbuf files and proto/struct packages from doclint

[Gold856]

Removes 111 159 warnings for #5808.
We already skip the quickbuf files for other styleguide things since we can't control them.
Are there any other packages we want to exclude?

[calcmogul]

Probably also edu/wpi/first/wpilibj/util/WPILibVersion.java since it's annoying to modify the version plugin.

There's some others like:

• edu/wpi/first/math/geometry/proto
• edu/wpi/first/math/geometry/struct
• edu/wpi/first/math/kinematics/proto
• edu/wpi/first/math/kinematics/struct

Would be good to comb the codebase for others.