rafs: fix some comments

Some comments are wrong or not well-formated, fix them.

Signed-off-by: bin liu <bin@hyper.sh>

rafs/src/fs.rs

@@ -72,7 +72,7 @@ fn default_amplify_io() -> u32 {
 /// Configuration information for filesystem data prefetch.
 #[derive(Clone, Default, Deserialize)]
 pub struct FsPrefetchControl {
-    /// Whether the filesystem layer data prefetch is enable or not.
+    /// Whether the filesystem layer data prefetch is enabled or not.
     #[serde(default)]
     pub enable: bool,
 

rafs/src/lib.rs

@@ -10,7 +10,7 @@
 //! by chunk content digest value. When Rafs file is used for container images, Rafs metadata blob
 //! contains all filesystem metadatas, such as directory, file name, permission etc. Actually file
 //! contents are divided into chunks and stored into data blobs. Rafs may built one data blob for
-//! each container image layer or build a  single data blob for the whole image, according to
+//! each container image layer or build a single data blob for the whole image, according to
 //! building options.
 //!
 //! There are several versions of Rafs filesystem defined:

rafs/src/metadata/direct_v6.rs

@@ -95,7 +95,6 @@ impl DirectMappingState {
             base: std::ptr::null(),
             end: std::ptr::null(),
             size: 0,
-            // mmapped_inode_table: false,
             validate_digest,
         }
     }

rafs/src/metadata/layout/v6.rs

@@ -214,7 +214,7 @@ impl RafsV6SuperBlock {
         self.magic() == EROFS_SUPER_MAGIC_V1
     }
 
-    /// Get maximum ino.
+    /// Set number of inodes.
     pub fn set_inos(&mut self, inos: u64) {
         self.s_inos = inos.to_le();
     }