Misc existing documentation fixes

- Fix awkward grammar which was tweaked in another spot in the docs

- fix defaultHeight snippet example that was missing a closing brace (change it to static #, since I added a lineCount example already earlier in the page)

- fix redundant =

src-docs/src/views/datagrid/datagrid_height_options_example.js

@@ -51,17 +51,16 @@ const rowHeightsSnippet = `rowHeightsOptions = {
   defaultHeight: 140, // default every row to 140px
   rowHeights: {
     1: {
-      lineCount: 5, // for row which have index 1 we allow to show 5 lines after that we truncate
+      lineCount: 5, // row at index 1 will show 5 lines
     },
-    4: 200, // for row which have index 4 we set 140 pixel
+    4: 200, // row at index 4 will adjust the height to 200px
     5: 80,
   },
 }`;
 
 const rowHeightsFullSnippet = `const rowHeightsOptions = useMemo(
   () => ({
-    defaultHeight: {
-      lineCount: 2,
+    defaultHeight: 140,
   }),
   []
 );

src-docs/src/views/datagrid/row_height_auto.tsx

@@ -136,7 +136,7 @@ const RenderCellValue: EuiDataGridProps['renderCellValue'] = ({
       content = <EuiMarkdownFormat>{item.body ?? ''}</EuiMarkdownFormat>;
     } else {
       // a full issue description is a *lot* to shove into a cell
-      content = content = (
+      content = (
         <EuiMarkdownFormat textSize="relative">
           {(item.body ?? '').slice(0, 300)}
         </EuiMarkdownFormat>

src-docs/src/views/datagrid/row_height_fixed.tsx

@@ -136,7 +136,7 @@ const RenderCellValue: EuiDataGridProps['renderCellValue'] = ({
       content = <EuiMarkdownFormat>{item.body ?? ''}</EuiMarkdownFormat>;
     } else {
       // a full issue description is a *lot* to shove into a cell
-      content = content = (
+      content = (
         <EuiMarkdownFormat textSize="relative">
           {(item.body ?? '').slice(0, 300)}
         </EuiMarkdownFormat>