Add missing full stop in Bootstrap checks doc (#35078)

Fixes #35075

docs/reference/setup/bootstrap-checks.asciidoc

@@ -193,7 +193,7 @@ Elasticsearch installs system call filters of various flavors depending
 on the operating system (e.g., seccomp on Linux). These system call
 filters are installed to prevent the ability to execute system calls
 related to forking as a defense mechanism against arbitrary code
-execution attacks on Elasticsearch The system call filter check ensures
+execution attacks on Elasticsearch. The system call filter check ensures
 that if system call filters are enabled, then they were successfully
 installed. To pass the system call filter check you must either fix any
 configuration errors on your system that prevented system call filters