updating lineheight mixin name

src/global_styling/mixins/_typography.scss

@@ -21,28 +21,28 @@
   @if $size == "xxxs" {
     @include euiFontSizeXS;
     font-weight: $euiFontWeightBold;
-    @include lineHeight(3);
+    @include lineHeightFromBaseline(3);
   } @else if $size == "xxs" {
     @include euiFontSizeS;
     font-weight: $euiFontWeightBold;
-    @include lineHeight(3);
+    @include lineHeightFromBaseline(3);
   } @else if $size == "xs" {
     @include euiFontSize;
     font-weight: $euiFontWeightMedium;
-    @include lineHeight(3);
+    @include lineHeightFromBaseline(3);
   } @else if $size == "s" {
     @include euiFontSizeL;
     font-weight: $euiFontWeightMedium;
-    @include lineHeight(4);
+    @include lineHeightFromBaseline(4);
   } @else if $size == "m" {
     @include euiFontSizeXL;
-    @include lineHeight(5);
+    @include lineHeightFromBaseline(5);
   } @else if $size == "l" {
     @include euiFontSizeXXL;
-    @include lineHeight(6);
+    @include lineHeightFromBaseline(6);
   } @else {
     @include fontSize($size);
-    @include lineHeight(3);
+    @include lineHeightFromBaseline(3);
   }
 }
 

src/global_styling/variables/_typography.scss

@@ -17,8 +17,10 @@
 }
 
 // Our base gridline is at 1/2 the font-size, ensure line-heights stay on that gridline.
-
-@mixin lineHeight($multiplier: 3) {
+// EX: A proper line-height for text is 1.5 times the font-size.
+//     If our base font size (euiFontSize) is 16, our baseline is 8 (16*1.5 / 3). To ensure the
+//     text stays on the baseline, we pass a multiplier to calculate a line-height in rems.
+@mixin lineHeightFromBaseline($multiplier: 3) {
   line-height: convertToRem(($euiFontSize/2)*$multiplier);
 }
 
@@ -29,7 +31,7 @@ $euiFontFamily: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial,
 $euiCodeFontFamily: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, Courier, monospace !default;
 
 // Font sizes -- scale is loosely based on Major Third (1.250)
-$euiTextScale: 2.25, 1.75, 1.25, 1.125, 1, .875, .75;
+$euiTextScale:      2.25, 1.75, 1.25, 1.125, 1, .875, .75;
 
 $euiFontSize:       $euiSize !default; // 5th position in scale