Fix spelling errors, API doc inconsistencies, and formatting issues.
* Fix several spelling errors.
* Prepend / to v1/event/list path in Watches.
* Rename script handlers to match Watch type.
* Remove /v1 path prefix on service health API endpoints.
Makes request path consistent with the rest of the HTTP API
documentation which does not include the /v1 prefix.
* Fix bracket formatting issue on Telemetry page.
The HTML codes used for brackets inside of the code block are not
interpolated, and are shown as literal strings.
Replace the numeric HTML codes with the intended character value to
fix display formatting.
Also placed variable reference on agent/options.html inside code block
for consistency with the presentation of other options on the page.
* Add missing word to Coordinate.Node docstring.
Resolves#6014
* Clean up handling of subprocesses and make using a shell optional
* Update docs for subprocess changes
* Fix tests for new subprocess behavior
* More cleanup of subprocesses
* Minor adjustments and cleanup for subprocess logic
* Makes the watch handler reload test use the new path.
* Adds check tests for new args path, and updates existing tests to use new path.
* Adds support for script args in Docker checks.
* Fixes the sanitize unit test.
* Adds panic for unknown watch type, and reverts back to Run().
* Adds shell option back to consul lock command.
* Adds shell option back to consul exec command.
* Adds shell back into consul watch command.
* Refactors signal forwarding and makes Windows-friendly.
* Adds a clarifying comment.
* Changes error wording to a warning.
* Scopes signals to interrupt and kill.
This avoids us trying to send SIGCHILD to the dead process.
* Adds an error for shell=false for consul exec.
* Adds notes about the deprecated script and handler fields.
* De-nests an if statement.
Blake Covarrubias