docs: contribute: Fixup dt_binding_check

Was missing a letter.

Signed-off-by: Jorge Marques <jorge.marques@analog.com>

Author: gastmaier

docs/contribute.rst

@@ -138,7 +138,7 @@ When submitting dt-bindings, you must check:
 .. shell::
 
    ~/linux
-   $make dt_binding_chec CONFIG_DTC=y DT_CHECKER_FLAGS=-m  DT_SCHEMA_FILES="./path/to/.yaml"
+   $make dt_binding_check CONFIG_DTC=y DT_CHECKER_FLAGS=-m  DT_SCHEMA_FILES="./path/to/.yaml"
 
 For warnings and erros and resolve accordingly.