Apply suggestions from code review

Thanks @aarongarciah

Co-authored-by: Aarón García Hervás <aaron.garcia.hervas@gmail.com>
Signed-off-by: Siriwat K <siriwatkunaporn@gmail.com>

Author: siriwatknp

docs/data/material/integrations/nextjs/nextjs.md

@@ -133,7 +133,7 @@ To use [CSS theme variables](/material-ui/customization/css-theme-variables/over
  });
 ```
 
-Learn more about [the advantages of CSS theme variables](/material-ui/customization/css-theme-variables/overview/#advantages) and how to [prevent SSR flicker](/material-ui/customization/css-theme-variables/configuration/#preventing-ssr-flickering).
+Learn more about [the advantages of CSS theme variables](/material-ui/customization/css-theme-variables/overview/#advantages) and how to [prevent SSR flickering](/material-ui/customization/css-theme-variables/configuration/#preventing-ssr-flickering).
 
 ### Using other styling solutions
 
@@ -373,4 +373,4 @@ To use [CSS theme variables](/material-ui/customization/css-theme-variables/over
  });
 ```
 
-Learn more about [the advantages of CSS theme variables](/material-ui/customization/css-theme-variables/overview/#advantages) and how to [prevent SSR flicker](/material-ui/customization/css-theme-variables/configuration/#preventing-ssr-flickering).
+Learn more about [the advantages of CSS theme variables](/material-ui/customization/css-theme-variables/overview/#advantages) and how to [prevent SSR flickering](/material-ui/customization/css-theme-variables/configuration/#preventing-ssr-flickering).