docs: sql v0.2

[MrPowers]

This PR adds API docs for the SQL functions that are added in v0.2.

I still need to get the library setup locally and double-check all the code snippets. Also need to add some more functions.

[petern48]

Suggested change

	Returns a geometry that represents all points whose distance from the input geometry is less than or equal to a specified distance.
	Since: v0.1.
	Returns a geometry that represents all points whose distance from the input geometry is less than or equal to a specified distance.
	Since: v0.1.
	Changed in version v0.2: Support buffer parameters argument

Something that might be easy to miss is that we added support for buffer params: #241

I always appreciate docs that mention versions when functions were added or received notable updates. More effort on us, but super helpful for developers. Pyspark does "versionchanged" along w/ a short comment like this example. I proposed a similar way to do it in the suggestion, but feel free to modify.

Here's a helpful docstring for updating the rest of the buffer docs

sedona-db/c/sedona-geos/src/st_buffer.rs

Lines 37 to 47 in 79cada0

	/// Supports two signatures:
	/// - ST_Buffer(geometry: Geometry, distance: Double)
	/// - ST_Buffer(geometry: Geometry, distance: Double, bufferStyleParameters: String)
	///
	/// Buffer style parameters format: "key1=value1 key2=value2 ..."
	/// Supported parameters:
	/// - endcap: round, flat/butt, square
	/// - join: round, mitre/miter, bevel
	/// - side: both, left, right
	/// - mitre_limit/miter_limit: numeric value
	/// - quad_segs/quadrant_segments: integer value

[MrPowers]

Good call, I like "changed in version..."!

[petern48]

Suggested change

	Construct a Geometry from WKT. This function also has the alias **ST_GeomFromText**.
	Construct a Geometry from WKT. This function also has the aliases **ST_GeomFromText** and ** ST_GeometryFromText**

Another thing easy to miss: new alias #213