misc: Fix spelling issues

Misspellings were identified by:
  https://github.com/marketplace/actions/check-spelling

* Initial corrections based on forbidden patterns from the action
* Additional corrections by Google Chrome auto-suggest
* Some manual corrections
* Adding markdown bullets to readme credits section

Signed-off-by: Josh Soref <2119212+jsoref@users.noreply.github.com>

src/main.rs

@@ -797,10 +797,10 @@ fn start_vmm(cmd_arguments: ArgMatches) -> Result<Option<String>, Error> {
 // This is a best-effort solution to the latency induced by the RCU
 // synchronization that happens in the kernel whenever the file descriptor table
 // fills up.
-// The table has initially 64 entries on amd64 and everytime it fills up, a new
+// The table has initially 64 entries on amd64 and every time it fills up, a new
 // table is created, double the size of the current one, and the entries are
 // copied to the new table. The filesystem code that does this uses
-// synchronize_rcu() to ensure all pre-existing RCU read-side critical sections
+// synchronize_rcu() to ensure all preexisting RCU read-side critical sections
 // have completed:
 //
 //     https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/fs/file.c?h=v6.9.1#n162