kbuild: Correct missing architecture-specific hyphens

These should add a hyphen to indicate that it makes a adjective. Fix
them.
Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>

Makefile

@@ -672,7 +672,7 @@ ifdef config-build
 # *config targets only - make sure prerequisites are updated, and descend
 # in scripts/kconfig to make the *config target
 
-# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
+# Read arch-specific Makefile to set KBUILD_DEFCONFIG as needed.
 # KBUILD_DEFCONFIG may point out an alternative default configuration
 # used for 'make defconfig'
 include $(srctree)/arch/$(SRCARCH)/Makefile
@@ -686,7 +686,7 @@ config: outputmakefile scripts_basic FORCE
 
 else #!config-build
 # ===========================================================================
-# Build targets only - this includes vmlinux, arch specific targets, clean
+# Build targets only - this includes vmlinux, arch-specific targets, clean
 # targets and others. In general all targets except *config targets.
 
 # If building an external module we do not care about the all: rule
@@ -1635,9 +1635,9 @@ help:
 	@echo  'Documentation targets:'
 	@$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
 	@echo  ''
-	@echo  'Architecture specific targets ($(SRCARCH)):'
+	@echo  'Architecture-specific targets ($(SRCARCH)):'
 	@$(or $(archhelp),\
-		echo '  No architecture specific help defined for $(SRCARCH)')
+		echo '  No architecture-specific help defined for $(SRCARCH)')
 	@echo  ''
 	@$(if $(boards), \
 		$(foreach b, $(boards), \
@@ -1679,7 +1679,7 @@ help-boards: $(help-board-dirs)
 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
 
 $(help-board-dirs): help-%:
-	@echo  'Architecture specific targets ($(SRCARCH) $*):'
+	@echo  'Architecture-specific targets ($(SRCARCH) $*):'
 	@$(if $(boards-per-dir), \
 		$(foreach b, $(boards-per-dir), \
 		printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \