Rollup merge of #102367 - notriddle:notriddle/help-text-align, r=Guil…

…laumeGomez

rustdoc: remove redundant `#help-button` CSS

When the separate top and bottom styles were added in cd3f4da, some of the CSS rules were needlessly duplicated.

The `text-align: initial` rule on `.side-by-side` was always redundant, since the rules that centered the text were set on children, not parents.

src/librustdoc/html/static/css/rustdoc.css

@@ -1025,8 +1025,6 @@ so that we can apply CSS-filters to change the arrow color in themes */
 	font-size: 1.125rem;
 }
 #help-button span.top {
-	text-align: center;
-	display: block;
 	margin: 10px 0;
 	border-bottom: 1px solid var(--border-color);
 	padding-bottom: 4px;
@@ -1036,9 +1034,6 @@ so that we can apply CSS-filters to change the arrow color in themes */
 	clear: both;
 	border-top: 1px solid var(--border-color);
 }
-.side-by-side {
-	text-align: initial;
-}
 .side-by-side > div {
 	width: 50%;
 	float: left;