Fix spelling and grammar in README

README.md

@@ -4,7 +4,7 @@ matrix-react-sdk
 This is a react-based SDK for inserting a Matrix chat/voip client into a web page.
 
 This package provides the React components needed to build a Matrix web client
-using React. It is not useable in isolation, and instead must must be used from
+using React. It is not useable in isolation, and instead must be used from
 a 'skin'. A skin provides:
  * Customised implementations of presentation components.
  * Custom CSS
@@ -82,7 +82,7 @@ practices that anyone working with the SDK needs to be be aware of and uphold:
  'Stealing' styling information from other components (including parents)
  is not cool, as it breaks the independence of the components.
 
- * CSS classes are named with an app-specific namespacing prefix to try to avoid
+ * CSS classes are named with an app-specific name-spacing prefix to try to avoid
  CSS collisions. The base skin shipped by Matrix.org with the matrix-react-sdk
  uses the naming prefix "mx_". A company called Yoyodyne Inc might use a
  prefix like "yy_" for its app-specific classes.
@@ -107,7 +107,7 @@ practices that anyone working with the SDK needs to be be aware of and uphold:
  .mx_RoomTile {} in RoomList.css - only RoomTile.css is allowed to define its
  own CSS. Instead, say .mx_RoomList .mx_RoomTile {} to scope the override
  only to the context of RoomList views. N.B. overrides should be relatively
- rare as in general CSS inheritence should be enough.
+ rare as in general CSS inheritance should be enough.
 
  * Components should render only within the bounding box of their outermost DOM
  element. Page-absolute positioning and negative CSS margins and similar are