adding /usr/local/bin/operator-sdk path (#1731)

* adding /usr/local/bin/operator-sdk path

Adding "&& sudo mkdir -p /usr/local/bin/operator-sdk"" for when the path doesn't exist already.

* Adjusting usr/local/bin path

removing trailing binary from path creation

Author: rhdedgar

doc/user/install-operator-sdk.md

@@ -60,9 +60,9 @@ Now you should be able to verify the binary.
 
 ```
 # Linux
-$ chmod +x operator-sdk-${RELEASE_VERSION}-x86_64-linux-gnu && sudo cp operator-sdk-${RELEASE_VERSION}-x86_64-linux-gnu /usr/local/bin/operator-sdk && rm operator-sdk-${RELEASE_VERSION}-x86_64-linux-gnu
+$ chmod +x operator-sdk-${RELEASE_VERSION}-x86_64-linux-gnu && sudo mkdir -p /usr/local/bin/ && sudo cp operator-sdk-${RELEASE_VERSION}-x86_64-linux-gnu /usr/local/bin/operator-sdk && rm operator-sdk-${RELEASE_VERSION}-x86_64-linux-gnu
 # macOS
-$ chmod +x operator-sdk-${RELEASE_VERSION}-x86_64-apple-darwin && sudo cp operator-sdk-${RELEASE_VERSION}-x86_64-apple-darwin /usr/local/bin/operator-sdk && rm operator-sdk-${RELEASE_VERSION}-x86_64-apple-darwin
+$ chmod +x operator-sdk-${RELEASE_VERSION}-x86_64-apple-darwin && sudo mkdir -p /usr/local/bin/ && sudo cp operator-sdk-${RELEASE_VERSION}-x86_64-apple-darwin /usr/local/bin/operator-sdk && rm operator-sdk-${RELEASE_VERSION}-x86_64-apple-darwin
 ```
 
 ## Install from Homebrew