Made headings consistent

Signed-off-by: Adam Harvey <adam.harvey@dxc.com>

plugins/api-docs/src/components/ComponentsCards/ConsumingComponentsCard.tsx

@@ -72,7 +72,9 @@ export const ConsumingComponentsCard = ({ variant = 'gridItem' }: Props) => {
       variant={variant}
       emptyContent={
         <div style={{ textAlign: 'center' }}>
-          <Typography variant="h6">No component consumes this API.</Typography>
+          <Typography variant="body1">
+            No component consumes this API.
+          </Typography>
           <Typography variant="body2">
             <Link to="https://backstage.io/docs/features/software-catalog/descriptor-format#specconsumesapis-optional">
               Learn how to change this.

plugins/api-docs/src/components/ComponentsCards/ProvidingComponentsCard.tsx

@@ -72,7 +72,9 @@ export const ProvidingComponentsCard = ({ variant = 'gridItem' }: Props) => {
       variant={variant}
       emptyContent={
         <div style={{ textAlign: 'center' }}>
-          <Typography variant="h6">No component provides this API.</Typography>
+          <Typography variant="body1">
+            No component provides this API.
+          </Typography>
           <Typography variant="body2">
             <Link to="https://backstage.io/docs/features/software-catalog/descriptor-format#specprovidesapis-optional">
               Learn how to change this.

plugins/catalog/src/components/HasComponentsCard/HasComponentsCard.tsx

@@ -75,7 +75,7 @@ export const HasComponentsCard = ({ variant = 'gridItem' }: Props) => {
       variant={variant}
       emptyContent={
         <div style={{ textAlign: 'center' }}>
-          <Typography variant="h6">
+          <Typography variant="body1">
             No component is part of this system.
           </Typography>
           <Typography variant="body2">

plugins/catalog/src/components/HasSubcomponentsCard/HasSubcomponentsCard.tsx

@@ -75,7 +75,7 @@ export const HasSubcomponentsCard = ({ variant = 'gridItem' }: Props) => {
       variant={variant}
       emptyContent={
         <div style={{ textAlign: 'center' }}>
-          <Typography variant="h6">
+          <Typography variant="body1">
             No subcomponent is part of this component.
           </Typography>
           <Typography variant="body2">

plugins/catalog/src/components/HasSystemsCard/HasSystemsCard.tsx

@@ -72,7 +72,7 @@ export const HasSystemsCard = ({ variant = 'gridItem' }: Props) => {
       variant={variant}
       emptyContent={
         <div style={{ textAlign: 'center' }}>
-          <Typography variant="h6">
+          <Typography variant="body1">
             No system is part of this domain.
           </Typography>
           <Typography variant="body2">