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[basicprofiles] Small improvement to documentation (#18290) 

* [basicprofiles] minor improvement to read me

Signed-off-by: Andrew Fiddian-Green <software@whitebear.ch>
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bundles/org.openhab.transform.basicprofiles/README.md
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@ -242,8 +242,10 @@ The `LHS_OPERAND` and the `RHS_OPERAND` can be either one of these:
This can be customized by specifying the "window size" or sample count applicable to the function, e.g. `$MEDIAN(10)` will return the median of the last 10 values. This can be customized by specifying the "window size" or sample count applicable to the function, e.g. `$MEDIAN(10)` will return the median of the last 10 values.
All the functions except `$DELTA` support a custom window size. All the functions except `$DELTA` support a custom window size.
In the case of comparisons and calculations involving `QuantityType` values, all the values are converted to the Unit of the linked Item before the calculation and/or comparison is done. In the case of comparisons and calculations involving `QuantityType` values, both operands, whether they are Item states, the incoming value, or constants, must be of the same type and have compatible units.
Note: if the binding sends a value that cannot be converted to the Unit of the linked Item, then that value is excluded. In other words a comparison between a `QuantityType` operand and an incoming `DecimalType` value (or vice versa) will fail.
All `QuantityType` values are converted to the Unit of the linked Item before the calculation and/or comparison is done.
So if the binding sends a value that cannot be converted to the Unit of the linked Item, then that value is excluded.
e.g. if the linked item has a Unit of `Units.METRE` and the binding sends a value of `Units.CELSIUS` then the value is ignored. e.g. if the linked item has a Unit of `Units.METRE` and the binding sends a value of `Units.CELSIUS` then the value is ignored.
The state of one item can be compared against the state of another item by having item names on both sides of the comparison, e.g.: `Item1 > Item2`. The state of one item can be compared against the state of another item by having item names on both sides of the comparison, e.g.: `Item1 > Item2`.