Added more property help docs

app/private/docs/property/point-buy.md

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+# Point buy
+
+A point buy is a set of rows that lets the user choose a set of stats based on a cost per stat.
+
+---
+
+### Table name
+
+The name of the point buy table.
+
+### Min
+
+The lowest value available for each row
+
+### Max
+
+The highest value available for each row
+
+### Cost
+
+A function that uses `value` as the value of a row and determines the cost of that value. For standard D&D 5e 27 point buy, this function is `[0, 1, 2, 3, 4, 5, 7, 9][value - 7]`
+
+### Total available points
+
+A [computed field](/docs/computed-fields) that determines how many points are available to spend in total
+
+## Rows
+
+Up to 32 rows can be added to a point buy table
+
+### Row name
+
+The name of the row that will appear in the table
+
+### Row variable name
+
+The variable name of the row that can be used in calculations. Must start with a letter and be made up of only letters and numbers without spaces, symbols, or punctiation.
+
+If the variable name matches an attribute with the same variable name, the row's value will be used as a base value for that attribute.