Clarify documentation, conditional logic

Co-authored-by: Emily KL <4672118+emilykl@users.noreply.github.com>

Author: camdecoster

src/components/legend/attributes.js

@@ -38,11 +38,11 @@ module.exports = {
         min: 0,
         editType: 'legend',
         description: [
-            'Sets the max height (in px) of the legend, or max height ratio (reference height * ratio) if less than one.',
+            'Sets the max height (in px) of the legend, or max height ratio (reference height * ratio) if less than or equal to 1.',
             'Default value is: 0.5 for horizontal legends; 1 for vertical legends. The minimum allowed height is 30px.',
             'For a ratio of 0.5, the legend will take up to 50% of the reference height before displaying a scrollbar.',
             'The reference height is the full layout height with the following exception: vertically oriented legends with',
-            'a `yref` of `"paper"`, unless the legend is located above/below the plot. In this case, the reference height',
+            'a `yref` of `"paper" located to the side of the plot. In this case, the reference height',
             'is the plot height.'
         ].join(' ')
     },

src/components/legend/draw.js

@@ -771,7 +771,7 @@ function computeLegendDimensions(gd, groups, traces, legendObj) {
 
     const { orientation, yref } = legendObj;
     let { maxheight } = legendObj;
-    const useFullLayoutHeight = isBelowPlotArea || isAbovePlotArea && !(orientation === "v" && yref === "paper")
+    const useFullLayoutHeight = (isBelowPlotArea || isAbovePlotArea) && !(orientation === "v" && yref === "paper")
     // Set default maxheight here since it depends on values passed in by user
     maxheight ||= useFullLayoutHeight ? 0.5 : 1;
     const heightToBeScaled = useFullLayoutHeight ? fullLayout.height : gs.h;