Remove duplicate restrictions from agent install page (#818) (#819)

(cherry picked from commit e07e651)

Co-authored-by: David Kilfoyle <[email protected]>

docs/en/ingest-management/elastic-agent/install-elastic-agent.asciidoc

@@ -14,15 +14,6 @@ invoking the wrong binary.
 * Running {agent} commands using the Windows PowerShell ISE is not supported.
 ====
 
-
-NOTE: You can install only a single {agent} per host. Due to the fact that the {agent} may read data sources that 
-are only accessible by a superuser, {agent} will therefore also need to be executed with superuser permissions.
-
-NOTE: You might need to log in as a root user (or Administrator on Windows) to
-run the commands described here. After the {agent} service is installed and running,
-make sure you run these commands without prepending them with `./` to avoid
-invoking the wrong binary.
-
 You have a few options for installing and managing an {agent}:
 
 * **Install a {fleet}-managed {agent} (recommended)**