Updated sass scss file extensions. Corrected description for sass command with no output file.

pages/common/sass.md

@@ -3,18 +3,18 @@
 > Converts SCSS or Sass files to CSS
 > .scss and .sass can be used interchangeably in below examples depending on your preference
 
-- Immediately convert scss file and output css with same filename
+- Output converted file to stdout
 
-`sass {{inputfile}}.scss`
+`sass {{inputfile.(scss|sass)}}`
 
 - Immediately convert SCSS or Sass file to CSS to specified output file
 
-`sass {{inputfile}}.scss {{outputfile}}.css`
+`sass {{inputfile.(scss|sass)}} {{outputfile.css}}`
 
 - Watch SCSS or Sass file for changes and output or update CSS file with same filename
 
-`sass --watch {{inputfile}}.scss`
+`sass --watch {{inputfile.(scss|sass)}}`
 
 - Watch SCSS or Sass file for changes and output or update CSS file with specified filename
 
-`sass --watch {{inputfile}}.scss:{{outputfile}}.css`
+`sass --watch {{inputfile.(scss|sass)}}:{{outputfile.css}}`