Fix bug #15375 with inaccurate docs of display margin width values.

 doc/lispref/display.texi (Display Margins): State the units of measuring
 margin width.

 src/buffer.c (syms_of_buffer) <left-margin-width, right-margin-width>:
 Doc fix.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/buffer.c b/src/buffer.c
index 0bcb608dbd3..3d7468904f2 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -5900,7 +5900,7 @@ See also the functions `display-table-slot' and `set-display-table-slot'.  */);
 
   DEFVAR_PER_BUFFER ("left-margin-width", &BVAR (current_buffer, left_margin_cols),
                      Qintegerp,
-                     doc: /* Width of left marginal area for display of a buffer.
+                     doc: /* Width in columns of left marginal area for display of a buffer.
 A value of nil means no marginal area.
 
 Setting this variable does not take effect until a new buffer is displayed
@@ -5908,7 +5908,7 @@ in a window.  To make the change take effect, call `set-window-buffer'.  */);
 
   DEFVAR_PER_BUFFER ("right-margin-width", &BVAR (current_buffer, right_margin_cols),
                      Qintegerp,
-                     doc: /* Width of right marginal area for display of a buffer.
+                     doc: /* Width in columns of right marginal area for display of a buffer.
 A value of nil means no marginal area.
 
 Setting this variable does not take effect until a new buffer is displayed