Enclose code in documentation in backticks

src/libextra/getopts.rs

@@ -10,11 +10,11 @@
 
 //! Simple getopt alternative.
 //!
-//! Construct a vector of options, either by using reqopt, optopt, and optflag
-//! or by building them from components yourself, and pass them to getopts,
-//! along with a vector of actual arguments (not including argv[0]). You'll
+//! Construct a vector of options, either by using `reqopt`, `optopt`, and `optflag`
+//! or by building them from components yourself, and pass them to `getopts`,
+//! along with a vector of actual arguments (not including `argv[0]`). You'll
 //! either get a failure code back, or a match. You'll have to verify whether
-//! the amount of 'free' arguments in the match is what you expect. Use opt_*
+//! the amount of 'free' arguments in the match is what you expect. Use `opt_*`
 //! accessors to get argument values out of the matches object.
 //!
 //! Single-character options are expected to appear on the command line with a
@@ -27,7 +27,7 @@
 //!
 //! The following example shows simple command line parsing for an application
 //! that requires an input file to be specified, accepts an optional output
-//! file name following -o, and accepts both -h and --help as optional flags.
+//! file name following `-o`, and accepts both `-h` and `--help` as optional flags.
 //!
 //! ~~~{.rust}
 //! exter mod extra;