dev-manual: Fixed two grammar errors

(From yocto-docs rev: 4e68646edf078c23e414a300b37cb30774b28be7)

Signed-off-by: Kristi Rifenbark <kristi.rifenbark@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/documentation/ref-manual/ref-variables.xml b/documentation/ref-manual/ref-variables.xml
index 8e5e8ce457..e4517dda52 100644
--- a/documentation/ref-manual/ref-variables.xml
+++ b/documentation/ref-manual/ref-variables.xml
@@ -11504,7 +11504,7 @@ recipes-graphics/xorg-font/font-alias_1.0.3.bb:PR = "${INC_PR}.3"
                     and <filename>${PV}</filename> is the recipe version.
                     If the source tarball extracts the code to a directory
                     named anything other than <filename>${BPN}-${PV}</filename>,
-                    or if the source code if fetched from an SCM such as
+                    or if the source code is fetched from an SCM such as
                     Git or Subversion, then you must set <filename>S</filename>
                     in the recipe so that the OpenEmbedded build system
                     knows where to find the unpacked source.