docs(env): update documentation

Author: mkroening

src/env/executable.rs

@@ -1,3 +1,8 @@
+//! Information about the executable.
+//!
+//! This module provides information about the currently running loaded
+//! executable image through different reserved linker symbols.
+
 use core::ops::Range;
 
 pub fn executable_ptr_range() -> Range<*mut ()> {

src/env/mod.rs

@@ -1,4 +1,4 @@
-//! Central parsing of the command-line parameters.
+//! Inspection and manipulation of the kernel's environment.
 
 mod executable;