[PATCH v2] docs: Add missing assumption

[Glenn Washburn]

Also reword a prior sentence to be more clear.

Fixes: 5a3d2b4742df (docs: Add debugging chapter to development documentation)
Signed-off-by: Glenn Washburn <development@efficientek.com>
---
Changes from v1:
 * Rebased onto latest master
---
 docs/grub-dev.texi | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/docs/grub-dev.texi b/docs/grub-dev.texi
index 0834ca562ad6..84d19dece9d6 100644
--- a/docs/grub-dev.texi
+++ b/docs/grub-dev.texi
@@ -660,10 +660,11 @@ GDB is started from the @file{grub-core} directory in the 
GRUB2 build
 directory. GRUB2 developers have made this more simple by including a GDB
 script which does much of the setup. This file is at @file{grub-core/gdb_grub}
 in the build directory and is also installed via @command{make install}.
-If not building GRUB, the distribution may have a package which installs
+When using a pre-built GRUB, the distribution may have a package which installs
 this GDB script along with debug symbol binaries, such as Debian's
-@samp{grub-pc-dbg} package. The GDB script is intended to be used
-like so, assuming:
+@samp{grub-pc-dbg} package. The GDB scripts is intended to by used
+like so, assuming that @samp{/path/to/script} is the path to the directory
+containing the gdb_grub script and debug symbol files:
 
 @example
 cd $(dirname /path/to/script/gdb_grub)
-- 
2.34.1