Update planner

[classicrocker883]

Description

planner.h / planner.cpp

• Update doxygen comments, spacing
• Remove redundant public/private
• • ie: friend void do_homing_move is out of place
• Define unlike variables excplitly

-  uint32_t max_acceleration_mm_per_s2[DISTINCT_AXES],
-           min_segment_time_us; 

+  uint32_t max_acceleration_mm_per_s2[DISTINCT_AXES];
+  uint32_t min_segment_time_us;

Requirements

Benefits

• Use correct doxygen syntax
• Improve details of functions in comments, readability
• By defining variables explicitly, reduce errors when reading from EEPROM

Configurations

Related Issues

[thinkyhead]

We don't need to enforce Doxygen style comments in Marlin because we don't generate documentation or publish APIs for, e.g., the Planner class. Thus for comments on Marlin-specific methods and functions let's make it a general principle going forward to try to stick to human-readable formatting. Also, Doxygen formatting is less necessary from 2024 onward because we have LLMs and other tools that can derive the same information without the need for strict formatting.