Fix lots of typos in C comments and Kconfig help text

fs/Kconfig

@@ -46,7 +46,7 @@ config PSEUDOFS_SOFTLINKS
 	default n
 	depends on !DISABLE_PSEUDOFS_OPERATIONS
 	---help---
-		Enable support for soft links in the pseudeo file system.  Soft
+		Enable support for soft links in the pseudo file system.  Soft
 		links are not supported within mounted volumes by any NuttX file
 		system.  However, if this option is selected, then soft links
 		may be add in the pseudo file system.  This might be useful, for

fs/mmap/Kconfig

@@ -21,7 +21,7 @@ config FS_RAMMAP
 		into RAM.  These copied files have some of the properties of
 		standard memory mapped files.
 
-		See nuttx/fs/mmap/README.txt for additonal information.
+		See nuttx/fs/mmap/README.txt for additional information.
 
 if FS_RAMMAP
 endif

fs/nfs/Kconfig

@@ -15,7 +15,7 @@ config NFS
 #if NFS
 
 config NFS_STATISTICS
-	bool "NFS Stastics"
+	bool "NFS Statics"
 	default n
 	depends on NFS
 	---help---

fs/nxffs/Kconfig

@@ -77,7 +77,7 @@ config NXFFS_PREALLOCATED
 	---help---
 		If CONFIG_NXFSS_PREALLOCATED is defined, then this is the single, pre-
 		allocated NXFFS volume instance.  Currently required because full,
-		dynamic allocation of NXFFS volumes in not yet supporte.
+		dynamic allocation of NXFFS volumes in not yet supported.
 
 config NXFFS_ERASEDSTATE
 	hex "FLASH erased state"

fs/procfs/fs_procfs.c

@@ -1151,7 +1151,7 @@ int procfs_register(FAR const struct procfs_entry_s *entry)
    * procfs entry table.  If that table were actively in use, then that
    * could cause procfs logic to use a stale memory pointer!  We avoid that
    * problem by requiring that the procfs file be unmounted when the new
-   * entry is added.  That requirment, however, is not enforced explicitly.
+   * entry is added.  That requirement, however, is not enforced explicitly.
    *
    * Locking the scheduler as done below is insufficient.  As would be just
    * marking the entries as volatile.