Doc: Fix the path to the xlat lib
The translation table library code has moved from lib/aarch64/ to
lib/xlat_tables/ since commit 3ca9928df but the Porting Guide still
points to the old location. This patch fixes this issue.
Change-Id: I983a9a100d70eacf6bac71725ffbb4bb5f3732b0
diff --git a/docs/porting-guide.md b/docs/porting-guide.md
index 0d713c4..f6dfe55 100644
--- a/docs/porting-guide.md
+++ b/docs/porting-guide.md
@@ -76,8 +76,8 @@
A platform port must enable the Memory Management Unit (MMU) as well as the
instruction and data caches for each BL stage. Setting up the translation
tables is the responsibility of the platform port because memory maps differ
-across platforms. A memory translation library (see `lib/aarch64/xlat_tables.c`)
-is provided to help in this setup. Note that although this library supports
+across platforms. A memory translation library (see `lib/xlat_tables/`) is
+provided to help in this setup. Note that although this library supports
non-identity mappings, this is intended only for re-mapping peripheral physical
addresses and allows platforms with high I/O addresses to reduce their virtual
address space. All other addresses corresponding to code and data must currently