refactor(pos.h): remove unused include; make formatting consistent (#17892)

- remove include of limit.h from pos.h, because it is no longer used
- make formatting more consistent in pos.h

src/nvim/pos.h

@@ -1,10 +1,8 @@
 #ifndef NVIM_POS_H
 #define NVIM_POS_H
 
-// for INT_MAX, LONG_MAX et al.
-#include <limits.h>
-
-typedef long linenr_T;         // line number type
+/// Line number type
+typedef long linenr_T;
 /// Format used to print values which have linenr_T type
 #define PRIdLINENR "ld"
 
@@ -15,31 +13,29 @@ typedef int colnr_T;
 
 /// Maximal (invalid) line number
 enum { MAXLNUM = 0x7fffffff, };
+
 /// Maximal column number
 /// MAXCOL used to be INT_MAX, but with 64 bit ints that results in running
 /// out of memory when trying to allocate a very long line.
 enum { MAXCOL = 0x7fffffff, };
-// Minimum line number
+
+/// Minimum line number
 enum { MINLNUM = 1, };
-// minimum column number
+
+/// Minimum column number
 enum { MINCOL = 1, };
 
-/*
- * position in file or buffer
- */
+/// position in file or buffer
 typedef struct {
-  linenr_T lnum;        // line number
-  colnr_T col;          // column number
+  linenr_T lnum;        ///< line number
+  colnr_T col;          ///< column number
   colnr_T coladd;
 } pos_T;
 
-
-/*
- * Same, but without coladd.
- */
+/// position in file or buffer, but without coladd
 typedef struct {
-  linenr_T lnum;        // line number
-  colnr_T col;          // column number
+  linenr_T lnum;        ///< line number
+  colnr_T col;          ///< column number
 } lpos_T;
 
 #endif  // NVIM_POS_H