Fix documentation typos and misspellings

Fix some typos and misspellings in TF-A documentation.

Signed-off-by: David Horstmann <david.horstmann@arm.com>
Change-Id: Id72553ce7b2f0bed9821604fbc8df4d4949909fa
diff --git a/docs/plat/rpi4.rst b/docs/plat/rpi4.rst
index beb0227..6e83fd7 100644
--- a/docs/plat/rpi4.rst
+++ b/docs/plat/rpi4.rst
@@ -60,7 +60,7 @@
 run after the SoC gets its power. The on-chip Boot ROM loads the next stage
 (bootcode.bin) from flash (EEPROM), which is again GPU code.
 This part knows how to access the MMC controller and how to parse a FAT
-filesystem, so it will load further compononents and configuration files
+filesystem, so it will load further components and configuration files
 from the first FAT partition on the SD card.
 
 To accommodate this existing way of configuring and setting up the board,