DOC: use shared docstrings for repeated args in Styler methods

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Many args repeat keyword args like subset, should be a consistent re useable shared docstring for these

• subset and props DOC: substitute multiple entries for subset in style.py #44454
• color DOC CLN: use color shared doc string #45251
• enc buf DOC: Shared doc string in render methods #45548
• color in highlight null DEPR: null_color since color used everywhere else #45907