Docs: rename Hello HarfBuzz to Getting Started.

docs/harfbuzz-docs.xml

diff --git a/docs/harfbuzz-docs.xml b/docs/harfbuzz-docs.xml
index b7d5cec..15d194c 100644
--- a/docs/harfbuzz-docs.xml
+++ b/docs/harfbuzz-docs.xml
@@ -33,7 +33,7 @@
     <title>User's manual</title>
       <xi:include href="usermanual-what-is-harfbuzz.xml"/>
       <xi:include href="usermanual-install-harfbuzz.xml"/>
-      <xi:include href="usermanual-hello-harfbuzz.xml"/>
+      <xi:include href="usermanual-getting-started.xml"/>
       <xi:include href="usermanual-shaping-concepts.xml"/>
       <xi:include href="usermanual-buffers-language-script-and-direction.xml"/>
       <xi:include href="usermanual-fonts-and-faces.xml"/>

docs/usermanual-getting-started.xml

diff --git a/docs/usermanual-hello-harfbuzz.xml b/docs/usermanual-getting-started.xml
similarity index 100%
rename from docs/usermanual-hello-harfbuzz.xml
rename to docs/usermanual-getting-started.xml