[DOCS/BUILD] Update watch script for Linux

[akainth015]

Description

Run the watch script on Linux

Motivation and Context

Better support for more development environments

How Has This Been Tested?

Used it to do the previous pull request #780

Types of changes

• Breaking change (fix or feature that would cause existing functionality to change)
• New feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• Documentation
• Test, CI, or build
• None

Components (if applicable)

• BentoService (model packaging, dependency management, handler definition)
• Model Artifact (model serialization, multi-framework support)
• Model Server (mico-batching, logging, metrics, tracing, benchmark, OpenAPI)
• YataiService (model management, deployment automation)
• Documentation

Checklist:

• My code follows the bentoml code style, both ./dev/format.sh and
  ./dev/lint.sh script have passed
  (instructions).
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• My change requires a change in bentoml/gallery example notebooks
• I have sent a pull request to bentoml/gallery to make that change

[codecov]

Codecov Report

Merging #781 into master will increase coverage by 0.18%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #781      +/-   ##
==========================================
+ Coverage   55.34%   55.53%   +0.18%     
==========================================
  Files         108      108              
  Lines        8143     8144       +1     
==========================================
+ Hits         4507     4523      +16     
+ Misses       3636     3621      -15     

Impacted Files	Coverage Δ
bentoml/artifact/__init__.py	100.00% <0.00%> (ø)
bentoml/artifact/spacy_model_artifact.py	40.54% <0.00%> (+40.54%)	⬆️

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[parano]

@akainth015 do you mind also add some quick notes about this to the development.md? It currently says watch.sh is MacOS only. It would be nice to also include links to how to install inotifywait. Thanks!

[akainth015]

@parano thanks, I hadn't noticed that it was in DEVELOPMENT.md. Since xdg-open should be there in most distros I just added instructions for inotifywait.