typo fixes

Author: jansenbe

docs/solution-guidance/portal-performance.md

@@ -10,16 +10,16 @@ Every portal design includes at least one aspect that requires customizing Share
 
 Implementing customizations to SharePoint Online places an even greater emphasis on effective design and development for web applications in general, and client-side web applications in particular, especially when it comes to the concept of application performance.
 
-> [!NOTE] 
+> [!NOTE]
 > Although this guidance primarily targets SharePoint Online, most of it also applies to portals hosted in an on-premises SharePoint environment.
 
 ## Optimizing Classic Portal Pages
 If you have not implemented Modern pages yet and are looking to optimize your existing or new Classic portal pages then this section applies to you.
-To assist with some intial page reviews and start the process of understanding performance on classic portal pages for SharePoint Online, the [Page Diagnostics tool for SharePoint](https://aka.ms/perftool) can be utilized.
-It is a Chrome extension developed by Microsoft to highlight guidance for optimzing Classic SharePoint portal pages. 
+To assist with some initial page reviews and start the process of understanding performance on classic portal pages for SharePoint Online, the [Page Diagnostics tool for SharePoint](https://aka.ms/perftool) can be utilized.
+It is a Chrome extension developed by Microsoft to highlight guidance for optimizing Classic SharePoint portal pages.
 
 Whilst some of the items highlighted relate to existing out of the box functionality, we are working towards removing these components as there are better alternatives that provide a faster user experience.The biggest culprit is the use of structural navigation.
-The tool also highlights enhanced functionlity e.g. Content Delivery Networks (CDNs), that have been made available by Microsoft to further optimize the end user experience. Please also see [Tune SharePoint Online Performance](https://aka.ms/spoperformance)
+The tool also highlights enhanced functionality e.g. Content Delivery Networks (CDNs), that have been made available by Microsoft to further optimize the end user experience. Please also see [Tune SharePoint Online Performance](https://aka.ms/spoperformance)
 
 What you will see is that between the Page Diagnostics tool and tuning guidance, they provide a high level overview of what impacts performance whilst the details on this page take you deeper into how customizations should be built to avoid impacting a pages performance.