docs: Update outdated `consul.io` links (#2708)

[david-yu]

Changes proposed in this PR:

• Pull in docs changes from #2708

How I've tested this PR:

How I expect reviewers to test this PR:

Checklist:

• [ ] Tests added
• [ ] CHANGELOG entry added

[david-yu]

@tanmay-pnaik Looks like our helm tests are failing here, so I can't pull these in. Are you able to make a PR against this branch to fix those test failures?

--- FAIL: TestFullValues (0.05s)
FAIL TestFullValues (0.05s)
FAIL .

DONE 25 tests, 1 failure in 8.334s

=== RUN   TestFullValues
    main_test.go:508: 
        	Error Trace:	main_test.go:508
        	Error:      	output not equal, actual output to full-values.actual
        	Test:       	TestFullValues
--- FAIL: TestFullValues (0.04s)
FAIL TestFullValues (re-run 1) (0.04s)
FAIL .

DONE 2 runs, 26 tests, 2 failures in 8.748s

=== RUN   TestFullValues
    main_test.go:508: 
        	Error Trace:	main_test.go:508
        	Error:      	output not equal, actual output to full-values.actual
        	Test:       	TestFullValues
--- FAIL: TestFullValues (0.04s)
FAIL TestFullValues (re-run 2) (0.04s)
FAIL .

=== Failed
=== FAIL: . TestFullValues (0.05s)
    main_test.go:508: 
        	Error Trace:	main_test.go:508
        	Error:      	output not equal, actual output to full-values.actual
        	Test:       	TestFullValues

=== FAIL: . TestFullValues (re-run 1) (0.04s)
    main_test.go:508: 
        	Error Trace:	main_test.go:508
        	Error:      	output not equal, actual output to full-values.actual
        	Test:       	TestFullValues

=== FAIL: . TestFullValues (re-run 2) (0.04s)
    main_test.go:508: 
        	Error Trace:	main_test.go:508
        	Error:      	output not equal, actual output to full-values.actual
        	Test:       	TestFullValues

DONE 3 runs, 27 tests, 3 failures in 9.144s

[tanmay-pnaik]

Hi @david-yu I have created https://github.com/hashicorp/consul-k8s/pull/2802

However, I am not sure why the tests are failing. I have checked that the same links are changed in both full-values.golden and full-values.yaml and also checked for errors in punctuation, spellings, etc. but haven't found anything significant.