Fix misc spelling errors found by lintian

Signed-off-by: Loïc Minier <loic.minier@linaro.org>
diff --git a/arch/sparc/cpu/leon3/cpu_init.c b/arch/sparc/cpu/leon3/cpu_init.c
index be22ec2..cba9d0e 100644
--- a/arch/sparc/cpu/leon3/cpu_init.c
+++ b/arch/sparc/cpu/leon3/cpu_init.c
@@ -57,9 +57,9 @@
  * initialize a bunch of registers.
  *
  * Run from FLASH/PROM:
- *  - until memory controller is set up, only registers avaiable
+ *  - until memory controller is set up, only registers available
  *  - no global variables available for writing
- *  - constants avaiable
+ *  - constants available
  */
 
 void cpu_init_f(void)