Fix typo in doc

Co-authored-by: Josh Triplett <josh@joshtriplett.org>

Author: ijackson

library/std/src/process.rs

@@ -1536,7 +1536,7 @@ impl ExitStatusError {
     ///
     /// In Unix terms the return value is the **exit status**: the value passed to `exit`, if the
     /// process finished by calling `exit`.  Note that on Unix the exit status is truncated to 8
-    /// bits, and that values that didn't come from a program's call to `exit` may be invented the
+    /// bits, and that values that didn't come from a program's call to `exit` may be invented by the
     /// runtime system (often, for example, 255, 254, 127 or 126).
     ///
     /// On Unix, this will return `None` if the process was terminated by a signal.  If you want to