[PATCH v3] docs: Makefile: wrap SPHINXDIRS help text

[mustafaelrasheid@gmail.com]

From: Mustafa Elrasheid <mustafaelrasheid@gmail.com>

When using `make help`, SPHINXDIR doesn't wrap around 80 characters,
causing text to overflow or wrap in incorrect ways,
which then makes the text difficult to read

Signed-off-by: Mustafa Elrasheid <mustafaelrasheid@gmail.com>
---
v3:
  - Moved SPHINXDIRS to a new line for better readability
  - Added `-g 75` to increase the goal of fmt instead of 93% of `-w 75`
v2:
  - Added '-s' in fmt to prevent word segmenting at the end of lines.
  - Reduced width in `fmt -w` to account for the added indentation of
    `sed`

 Documentation/Makefile | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Documentation/Makefile b/Documentation/Makefile
index e96ac6dcac4f..377a449656c8 100644
--- a/Documentation/Makefile
+++ b/Documentation/Makefile
@@ -98,7 +98,8 @@ dochelp:
 	@echo  '  cleandocs       - clean all generated files'
 	@echo
 	@echo  '  make SPHINXDIRS="s1 s2" [target] Generate only docs of folder s1, s2'
-	@echo  '  top level values for SPHINXDIRS are: $(_SPHINXDIRS)'
+	@echo  '  top level values for SPHINXDIRS are:'
+	@echo  '$(_SPHINXDIRS)' | fmt -s -w 75 -g 75 | sed 's/^/    /'
 	@echo  '  you may also use a subdirectory like SPHINXDIRS=userspace-api/media,'
 	@echo  '  provided that there is an index.rst file at the subdirectory.'
 	@echo
-- 
2.39.5