2to3: update grammar and examples (#5431)

Fixed some glaring mistakes in grammar and added a new example.

pages/common/2to3.md

@@ -1,9 +1,9 @@
 # 2to3
 
-> Automated Python 2 to 3 code translation.
+> Automated Python 2 to 3 code conversion.
 > More information: <https://docs.python.org/3/library/2to3.html>.
 
-- Display changes that would be performed:
+- Display the changes that would be performed without performing them (dry-run):
 
 `2to3 {{path/to/file.py}}`
 
@@ -11,18 +11,22 @@
 
 `2to3 --write {{path/to/file.py}}`
 
-- Convert a specified Python 2 feature to Python 3:
+- Convert specific Python 2 language features to Python 3:
 
-`2to3 --write {{file.py}} --fix={{raw_input}} --fix={{print}}`
+`2to3 --write {{path/to/file.py}} --fix={{raw_input}} --fix={{print}}`
 
-- Convert all features except *raw_input* the specified ones to Python 3:
+- Convert all Python 2 language features except the specified ones to Python 3:
 
-`2to3 --nofix={{raw_input}} --fix={{print}} example.py`
+`2to3 --write {{path/to/file.py}} --nofix={{has_key}} --nofix={{isinstance}}`
 
-- Display the list of available transformation features:
+- Display a list of all available language features that can be converted from Python 2 to Python 3:
 
 `2to3 --list-fixes`
 
-- Convert an entire directory:
+- Convert all Python 2 files in a directory to Python 3:
 
-`2to3 --output-dir={{path/to/code_python3_version}} --write-unchanged-files --nobackups {{path/to/code_python2_version}}`
+`2to3 --output-dir={{path/to/python3_directory}} --write-unchanged-files --nobackups {{path/to/python2_directory}}`
+
+- Run 2to3 with multiple threads:
+
+`2to3 --processes={{4}} --output-dir={{path/to/python3_directory}} --write --nobackups --no-diff {{path/to/python2_directory}}`