Update Korean translation

[TangoEnSkai]

To people who want to contribute

We encourage you to create a PR proactively to support this.
Otherwise, I am going to finish:

• updating the contents up-to-date
• improve Korean translation

What

• update the Korean translation with the
  • recent update: 2020/06/10
  • 2020/04/19
  • 2022/03/30
  • 2022/10/18
• all new updates that have not been updated yet in Korean

Why

• the main recent update: 2020/06/10 has been merged into master
• current translation is not aligned with the latest doc

TODO

update these topics:

• Introduction: update introduction #13
• Guidelines: WIP by @TangoEnSkai
• Pointers to Interfaces: update pointers-to-interface #14
• Verify Interface Compliance: add verify interface compliance #15
• Receivers and Interfaces: update(docs): receivers and interfaces #16
• Zero-value Mutexes are Valid update(docs): zero value mutaxes are valid #17
• Copy Slices and Maps at Boundaries update(docs): copy slices and maps at boundaries #18
• Defer to Clean Up update(docs): defer to clean up #19
• Channel Size is One or None updated(docs) handle time #20 WIP by @TangoEnSkai
• Start Enums at One
• Use "time" to handle time
• Error Types
• Error Wrapping
• Handle Type Assertion Failures
• Don't Panic
• Use go.uber.org/atomic
• Avoid Mutable Globals
• Avoid Embedding Types in Public Structs
• Avoid Using Built-In Names
• Avoid init()
• Exit in Main
• Exit Once
• Performance
• Prefer strconv over fmt
• Avoid string-to-byte conversion
• Prefer Specifying Container Capacity
• Specifying Map Capacity Hints
• Specifying Slice Capacity
• Style
• Be Consistent
• Group Similar Declarations
• Import Group Ordering
• Package Names
• Function Names
• Import Aliasing
• Function Grouping and Ordering
• Reduce Nesting
• Unnecessary Else
• Top-level Variable Declarations
• Prefix Unexported Globals with _
• Embedding in Structs
• Local Variable Declarations
• nil is a valid slice
• Reduce Scope of Variables
• Avoid Naked Parameters
• Use Raw String Literals to Avoid Escaping
• Initializing Structs
• Use Field Names to Initialize Structs
• Omit Zero Value Fields in Structs
• Use var for Zero Value Structs
• Initializing Struct References
• Initializing Maps
• Format Strings outside Printf
• Naming Printf-style Functions
• Patterns
• Test Tables
• Functional Options
• Linting

[Yupjun]

@TangoEnSkai Do you have any plan to update those? I want to contribute to the golang translation.

[TangoEnSkai]

@TangoEnSkai Do you have any plan to update those? I want to contribute to the golang translation.

@Yupjun sorry for my late reply. I had a very long vacation.

Sure, you can create a PR for these.

I am actually thinking about restarting this issue in this month.
Let me know if you want to contribute, and which part you want to do.

**also, let me update this issue with the latest release since the target content [2020/04/19](https://github.com/uber-go/guide/blob/master/CHANGELOG.md#2021-04-19) seems out of date.

We can aim for the latest version: https://github.com/uber-go/guide/blob/master/CHANGELOG.md#2022-03-30