[Docs] fix options formatting

Author: ljharb

readme.markdown

@@ -59,17 +59,15 @@ options are:
 
 * opts.isFile - function to asynchronously test whether a file exists
 
-* opts.packageFilter - transform the parsed package.json contents before looking
-at the "main" field
+* `opts.packageFilter(pkg, pkgfile)` - transform the parsed package.json contents before looking at the "main" field
 
-* opts.pathFilter(pkg, path, relativePath) - transform a path within a package
+* `opts.pathFilter(pkg, path, relativePath)` - transform a path within a package
   * pkg - package data
   * path - the path being resolved
   * relativePath - the path relative from the package.json location
   * returns - a relative path that will be joined from the package.json location
 
-* opts.paths - require.paths array to use if nothing is found on the normal
-node_modules recursive walk (probably don't use this)
+* opts.paths - require.paths array to use if nothing is found on the normal `node_modules` recursive walk (probably don't use this)
 
 * opts.moduleDirectory - directory (or directories) in which to recursively look for modules. default: `"node_modules"`
 
@@ -115,11 +113,9 @@ options are:
 
 * opts.isFile - function to synchronously test whether a file exists
 
-* `opts.packageFilter(pkg, pkgfile)` - transform the parsed package.json
-* contents before looking at the "main" field
+* `opts.packageFilter(pkg, pkgfile)` - transform the parsed package.json contents before looking at the "main" field
 
-* opts.paths - require.paths array to use if nothing is found on the normal
-node_modules recursive walk (probably don't use this)
+* opts.paths - require.paths array to use if nothing is found on the normal `node_modules` recursive walk (probably don't use this)
 
 * opts.moduleDirectory - directory (or directories) in which to recursively look for modules. default: `"node_modules"`