Adjust pyenv content

1. Remove a spurious space in several themes.
2. Add example for POWERLEVEL9K_PYENV_SHOW_ON_COMMAND

config/p10k-classic.zsh

@@ -992,6 +992,9 @@
   typeset -g POWERLEVEL9K_PYENV_PROMPT_ALWAYS_SHOW=false
   # If set to false, hide python version if it's equal to "system".
   typeset -g POWERLEVEL9K_PYENV_SHOW_SYSTEM=true
+  # Show pyenv only when the command you are typing matches one of these strings.
+  # Tip: You might want to enable POWERLEVEL9K_PYENV_PROMPT_ALWAYS_SHOW above.
+  # typeset -g POWERLEVEL9K_PYENV_SHOW_ON_COMMAND='py*|pip*|poetry|virtualenv'
 
   # Pyenv segment format. The following parameters are available within the expansion.
   #

config/p10k-lean-8colors.zsh

@@ -970,6 +970,9 @@
   typeset -g POWERLEVEL9K_PYENV_PROMPT_ALWAYS_SHOW=false
   # If set to false, hide python version if it's equal to "system".
   typeset -g POWERLEVEL9K_PYENV_SHOW_SYSTEM=true
+  # Show pyenv only when the command you are typing matches one of these strings.
+  # Tip: You might want to enable POWERLEVEL9K_PYENV_PROMPT_ALWAYS_SHOW above.
+  # typeset -g POWERLEVEL9K_PYENV_SHOW_ON_COMMAND='py*|pip*|poetry|virtualenv'
 
   # Pyenv segment format. The following parameters are available within the expansion.
   #

config/p10k-lean.zsh

@@ -966,6 +966,9 @@
   typeset -g POWERLEVEL9K_PYENV_PROMPT_ALWAYS_SHOW=false
   # If set to false, hide python version if it's equal to "system".
   typeset -g POWERLEVEL9K_PYENV_SHOW_SYSTEM=true
+  # Show pyenv only when the command you are typing matches one of these strings.
+  # Tip: You might want to enable POWERLEVEL9K_PYENV_PROMPT_ALWAYS_SHOW above.
+  # typeset -g POWERLEVEL9K_PYENV_SHOW_ON_COMMAND='py*|pip*|poetry|virtualenv'
 
   # Pyenv segment format. The following parameters are available within the expansion.
   #

config/p10k-rainbow.zsh

@@ -1038,6 +1038,9 @@
   typeset -g POWERLEVEL9K_PYENV_PROMPT_ALWAYS_SHOW=false
   # If set to false, hide python version if it's equal to "system".
   typeset -g POWERLEVEL9K_PYENV_SHOW_SYSTEM=true
+  # Show pyenv only when the command you are typing matches one of these strings.
+  # Tip: You might want to enable POWERLEVEL9K_PYENV_PROMPT_ALWAYS_SHOW above.
+  # typeset -g POWERLEVEL9K_PYENV_SHOW_ON_COMMAND='py*|pip*|poetry|virtualenv'
 
   # Pyenv segment format. The following parameters are available within the expansion.
   #