Documentation: change coreboot to lowercase

The word 'coreboot' should always be written in lowercase, even at the
start of a sentence.

Unfortunately, some external websites and projects are spelling coreboot
with an uppercase C, so references to those pages can't be changed
without breaking the link.

Change-Id: I79824da8a9ed36a1e4fe23a1711a89535267bf5f
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/20031
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
diff --git a/Documentation/Makefile b/Documentation/Makefile
index 96b66a9..ecfbdb4 100644
--- a/Documentation/Makefile
+++ b/Documentation/Makefile
@@ -7,7 +7,7 @@
 
 FIGS=codeflow.pdf hypertransport.pdf
 
-all: CorebootPortingGuide.pdf Kconfig.pdf
+all: corebootPortingGuide.pdf Kconfig.pdf
 
 SVG2PDF=$(shell which svg2pdf)
 INKSCAPE=$(shell which inkscape)
@@ -31,13 +31,13 @@
 	convert $< $@
 endif
 
-CorebootPortingGuide.toc: $(FIGS) CorebootBuildingGuide.tex
+corebootPortingGuide.toc: $(FIGS) corebootBuildingGuide.tex
 	# 2 times to make sure we have a current toc.
-	$(PDFLATEX) CorebootBuildingGuide.tex
-	$(PDFLATEX) CorebootBuildingGuide.tex
+	$(PDFLATEX) corebootBuildingGuide.tex
+	$(PDFLATEX) corebootBuildingGuide.tex
 
-CorebootPortingGuide.pdf: $(FIGS) CorebootBuildingGuide.tex CorebootPortingGuide.toc
-	$(PDFLATEX) CorebootBuildingGuide.tex
+corebootPortingGuide.pdf: $(FIGS) corebootBuildingGuide.tex corebootPortingGuide.toc
+	$(PDFLATEX) corebootBuildingGuide.tex
 
 Kconfig.pdf: Kconfig.tex mainboardkconfig.tex cpukconfig.tex socketfkconfig.tex
 	$(PDFLATEX) $<
@@ -67,4 +67,4 @@
 	rm -f *.aux *.idx *.log *.toc *.out $(FIGS) mainboardkconfig.tex skconfig.tex cpukconfig.tex socketfkconfig.tex
 
 distclean: clean
-	rm -f CorebootPortingGuide.pdf Kconfig.pdf
+	rm -f corebootPortingGuide.pdf Kconfig.pdf