doc: fix typos

Signed-off-by: Peter Meerwald <p.meerwald@bct-electronic.com>
diff --git a/doc/README.SPL b/doc/README.SPL
index f01a8bd..0276953 100644
--- a/doc/README.SPL
+++ b/doc/README.SPL
@@ -42,8 +42,8 @@
 
 #define CONFIG_SPL
 
-Because SPL images normally have a different text base, one have to be
-configured by defining CONFIG_SPL_TEXT_BASE. The linker script have to be
+Because SPL images normally have a different text base, one has to be
+configured by defining CONFIG_SPL_TEXT_BASE. The linker script has to be
 defined with CONFIG_SPL_LDSCRIPT.
 
 To support generic U-Boot libraries and drivers in the SPL binary one can