docs: fix English spelling and grammar across pattern documentation

[Technocrat-dev]

What this PR does / why we need it:

Fixes English spelling and grammar errors across 12 pattern documentation files. Found these while reading through the patterns.

Fixes #7

Changes:

Serving patterns:

• Asynchronous: "poling" -> "polling", "predition" -> "prediction", "disposes" -> "discard"
• Circuit-break: "take a file" -> "take a while", "respond the" -> "respond to the"
• Web-single: "it's" -> "its" (possessive)
• Prep-pred: "binalized" -> "binarized"
• Microservice-horizontal: "prediciton" -> "prediction", "parallelly" -> "in parallel"
• Serving-template: "smodel" -> "model", "choise" -> "choice", "paramenter" -> "parameter"
• Multiple-stage: "fare" -> "fair"

QA patterns:

• Shadow AB test: "verity" -> "verify" (x2), "the a" -> "that a"
• Online AB test: "verity" -> "verify" (x2), "the a" -> "that a", "parallelly" -> "in parallel"
• Loading test: "test" -> "text" (in data type list)

Operation patterns:

• Prediction-monitoring: Added missing # in markdown header
• Data-model-versioning: "differenct" -> "different", "fuction" -> "function", "paramater" -> "parameter"

Special notes for your reviewer:

All changes are spelling/grammar only, no content changes. This is my first contribution to this project.