Remove useless and outdated write_psi_r_1 interface and improve related docs and examples

[AsTonyshment]

Overview

Fix #5209.

This pull request includes updates to documentation, example files, and minor corrections across several files. The changes also involve improving the clarity and accuracy of wave function output instructions, fixing typographical errors, and updating file references.

The most important change is removing useless and outdated write_psi_r_1 and write_chg_r_1 interface. Now all real-space information is output in .cube format.

Documentation Improvements:

• Updated the wave function extraction guide in docs/advanced/elec_properties/wfc.md to clarify instructions for outputting wave functions in G-space and real space. This includes new file naming conventions and examples.
• Corrected descriptions for output file naming in docs/advanced/input_files/input-main.md to fix typographical errors and improve readability.

Example File Updates:

• Updated wave function example descriptions in examples/11_wfc/README to align with new naming conventions and provide clearer instructions for both G-space and real-space outputs.
• Fixed outdated file references and updated example scripts (run.sh) in examples/11_wfc to reflect new wave function file naming conventions.