Correct README punctuation

Add two missing dots and remove space before exclamation mark

README.md

@@ -38,7 +38,7 @@ And then use this library (change `(the latest version)` to the latest version!)
 ```
 
 # Contributing
-Contributions are welcome ! :D
+Contributions are welcome! :D
 
 Most contributions will require you to agree to a Contributor License Agreement (CLA) declaring that you have the right to,
 and actually do, grant us the rights to use your contribution. For details, visit https://cla.microsoft.com.
@@ -128,8 +128,8 @@ the reason why is inside this exception map.
 ## Displaying usage info
 There are two forms of "usage strings" provided by this library, both require a target node.
 
-`getAllUsage(node, source, restricted)`  will return a list of all possible commands (executable end-points) under the target node and their human readable path. If `restricted`, it will ignore commands that `source` does not have access to. This will look like [`foo`, `foo <bar>`]
+`getAllUsage(node, source, restricted)`  will return a list of all possible commands (executable end-points) under the target node and their human readable path. If `restricted`, it will ignore commands that `source` does not have access to. This will look like [`foo`, `foo <bar>`].
 
-`getSmartUsage(node, source)` will return a map of the child nodes to their "smart usage" human readable path. This tries to squash future-nodes together and show optional & typed information, and can look like `foo (<bar>)`
+`getSmartUsage(node, source)` will return a map of the child nodes to their "smart usage" human readable path. This tries to squash future-nodes together and show optional & typed information, and can look like `foo (<bar>)`.
 
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