fix: rename ip16 to ip6

[liangyuanpeng]

just fix the typo, ip16->ip6

releated:

• net.to_IP16 is nonsensical #1904
• to_IP16 should return either int or string in both document and in implementation #1938

1. Does this PR affect any open issues?(Y/N) and add issue references (e.g. "fix #123", "re #123".):

• N
• Y

2. What is the scope of this PR (e.g. component or file name):

3. Provide a description of the PR(e.g. more details, effects, motivations or doc link):

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Other

4. Are there any breaking changes?(Y/N) and describe the breaking changes(e.g. more details, motivations or doc link):

• N
• Y

5. Are there test cases for these changes?(Y/N) select and add more details, references or doc links:

• Unit test
• Integration test
• Benchmark (add benchmark stats below)
• Manual test (add detailed scripts or steps below)
• Other

[coveralls]

Pull Request Test Coverage Report for Build 15339428282

Details

• 2 of 3 (66.67%) changed or added relevant lines in 2 files are covered.
• 12 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.02%) to 70.626%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
kclvm/runtime/src/net/mod.rs	1	2	50.0%

Files with Coverage Reduction	New Missed Lines	%
kclvm/tools/src/LSP/src/state.rs	12	69.48%

Totals
Change from base Build 15326152765:	-0.02%
Covered Lines:	53919
Relevant Lines:	76344

---

💛 - Coveralls