Fixed sed commands to allow for options after shebangs.

Author: torsava

subsections/h3-prep.inc

@@ -32,16 +32,16 @@ To change the shebangs in the files you can use one (or a combination) of the fo
 .. code-block:: console
 
    # Change shebang in individual files
-   sed -i '1s_^#!/usr/bin/\(python\|env python\)$_#!/usr/bin/python3_' path/to/file1 file2 file3 ...
+   sed -i '1s_^#!/usr/bin/\(python\|env python\)_#!/usr/bin/python3_' path/to/file1 file2 file3 ...
 
    # Change shebang in all files in this directory and all subdirectories
    # See `man find` for how the `-exec command ;` syntax works
-   find . -type f -exec sed -i '1s_^#!/usr/bin/\(python\|env python\)$_#!/usr/bin/python3_' {} \;
+   find . -type f -exec sed -i '1s_^#!/usr/bin/\(python\|env python\)_#!/usr/bin/python3_' {} \;
 
    # Change shebang in all executable files in this directory and all subdirectories
-   find . -type f -executable -exec sed -i '1s_^#!/usr/bin/\(python\|env python\)$_#!/usr/bin/python3_' {} \;
+   find . -type f -executable -exec sed -i '1s_^#!/usr/bin/\(python\|env python\)_#!/usr/bin/python3_' {} \;
 
-You don't have to worry about accidentally corrupting other files as these scripts will only change a file if its first line exactly matches one of the two aforementioned shebangs.
+You don't have to worry about accidentally corrupting other files as these scripts will only change a file if the beginning of its first line exactly matches one of the two aforementioned shebangs.
 
 Autodetection of Runtime Dependencies
 +++++++++++++++++++++++++++++++++++++