[GSoC][PATCH] builtin/clean.c: fix error message usage typo

[Shuqi Liang <cheskaqiqi@gmail.com>]

As Documentation/CodingGuidelines says, we shouldn't capitalize the first
word in error message. Change the capital letter to lowercase letter.

Signed-off-by: Shuqi Liang <cheskaqiqi@gmail.com>
---
 builtin/clean.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/builtin/clean.c b/builtin/clean.c
index b2701a2815..e6ce776001 100644
--- a/builtin/clean.c
+++ b/builtin/clean.c
@@ -30,14 +30,14 @@ static const char *const builtin_clean_usage[] = {
 	NULL
 };
 
-static const char *msg_remove = N_("Removing %s\n");
-static const char *msg_would_remove = N_("Would remove %s\n");
-static const char *msg_skip_git_dir = N_("Skipping repository %s\n");
-static const char *msg_would_skip_git_dir = N_("Would skip repository %s\n");
+static const char *msg_remove = N_("removing %s\n");
+static const char *msg_would_remove = N_("would remove %s\n");
+static const char *msg_skip_git_dir = N_("skipping repository %s\n");
+static const char *msg_would_skip_git_dir = N_("would skip repository %s\n");
 static const char *msg_warn_remove_failed = N_("failed to remove %s");
 static const char *msg_warn_lstat_failed = N_("could not lstat %s\n");
-static const char *msg_skip_cwd = N_("Refusing to remove current working directory\n");
-static const char *msg_would_skip_cwd = N_("Would refuse to remove current working directory\n");
+static const char *msg_skip_cwd = N_("refusing to remove current working directory\n");
+static const char *msg_would_skip_cwd = N_("would refuse to remove current working directory\n");
 
 enum color_clean {
 	CLEAN_COLOR_RESET = 0,
-- 
2.39.0