Minimal shape docs

[ksen0]

Using abridged list from: #7734 but focusing only on minimal necessary docs to get started:

• Document bezierOrder()
• Update bezierVertex() docs
• Remove quadraticVertex() docs
• Document splineVertex()
• Remove curveVertex() (it's already supported by the 1.x compatibility add-on for shapes)
• Review vertexProperty() docs (sense check)
• Document splineProperty()
• Document splineProperties()
• Update beginShape() docs - reviewed, already OK
• Update beginContour() docs
• Document new endShape/Contour(CLOSE) behavior for splines
• Update endContour(CLOSE) docs
• Update curve() docs to reflect name change to spline()
• Remove curveTightness() docs
• Update curvePoint() docs to reflect name change to splinePoint()
• Update curveTangent() docs to reflect name change to splineTangent()
• Update curveDetail() docs, possibly incorporating adapted examples from bezierDetail() docs
• Remove bezierDetail() docs
• remove beginGeometry()/endGeometry() docs
• Update vertex() docs - https://beta.p5js.org/reference/p5/texture/

[ksen0]

@davepagurek Actually should this be removed?