[core] minor documentation improvements (#142)

* fix BitBlock number

* fix typos

core/src/env/test_env.rs

@@ -402,7 +402,7 @@ thread_local! {
     /// The test environment data.
     ///
     /// This needs to be thread local since tests are run
-    /// in paralell by default which may lead to data races otherwise.
+    /// in parallel by default which may lead to data races otherwise.
     pub static TEST_ENV_DATA: RefCell<TestEnvData> = {
         RefCell::new(TestEnvData::default())
     };

core/src/storage/cell/raw_cell.rs

@@ -43,7 +43,7 @@ use parity_codec::{
 /// Read more about kinds of guarantees and their effect [here](../index.html#guarantees).
 #[derive(Debug, PartialEq, Eq, Hash, Encode, Decode)]
 pub struct RawCell {
-    /// The key to the associated constract storage slot.
+    /// The key to the associated contract storage slot.
     key: Key,
     /// Marker that prevents this type from being `Copy` or `Clone` by accident.
     non_clone: NonCloneMarker<()>,

core/src/storage/cell/sync_cell.rs

@@ -31,7 +31,7 @@ use core::cell::RefCell;
 /// A synchronized cell.
 ///
 /// Provides interpreted, read-optimized and inplace-mutable
-/// access to the associated constract storage slot.
+/// access to the associated contract storage slot.
 ///
 /// # Guarantees
 ///

core/src/storage/chunk/raw_chunk.rs

@@ -39,7 +39,7 @@ use crate::{
 /// Read more about kinds of guarantees and their effect [here](../index.html#guarantees).
 #[derive(Debug, PartialEq, Eq)]
 pub struct RawChunk {
-    /// The key to the associated constract storage slot.
+    /// The key to the associated contract storage slot.
     key: Key,
     /// Marker that prevents this type from being `Copy` or `Clone` by accident.
     non_clone: NonCloneMarker<()>,
@@ -115,7 +115,7 @@ impl RawChunk {
         }
     }
 
-    /// Returns the unterlying key to the cells.
+    /// Returns the underlying key to the cells.
     ///
     /// # Note
     ///

core/src/storage/chunk/sync_chunk/chunk.rs

@@ -27,7 +27,7 @@ use crate::storage::{
 
 /// A chunk of synchronized cells.
 ///
-/// Provides mutable and read-optimized access to the associated constract storage slot.
+/// Provides mutable and read-optimized access to the associated contract storage slot.
 ///
 /// # Guarantees
 ///

core/src/storage/collections/bitvec/mod.rs

@@ -30,7 +30,7 @@
 //! ```no-compile
 //! | bit 0 | ... | bit 32 | ... | bit 0 | ... | bit 32 | bit 0 | ... | bit 32 | ... | bit 0 | ... | bit 32 |
 //! |      BitPack 0       | ... |      BitPack 32      |      BitPack 0       | ... |      BitPack 32      |
-//! |                     BitBlock 0                    |                     BitBlock 0                    |
+//! |                     BitBlock 0                    |                     BitBlock 1                    |
 //! ```
 //!
 //! The above pseudo code represents a [`BitVec`](struct.BitVec.html) with 1024 bits.

core/src/storage/mod.rs

@@ -24,7 +24,7 @@
 //! |:-------------|:------------|
 //! | `Owned`      | Disallows aliasing between different kinds of these primitives. |
 //! | `Typed`      | Automatically encodes and decodes the stored entity. |
-//! | `Opt. Reads` | Tries to avoid unnecesary reads to the storage. |
+//! | `Opt. Reads` | Tries to avoid unnecessary reads to the storage. |
 //! | `Mutable`    | Allows inplace mutation of the stored entity. |
 //! | `Safe Load`  | Guarantees to always have a valid element stored in the associated contract storage slot. |
 //!
@@ -45,7 +45,7 @@
 //!
 //! ### Entities
 //!
-//! The highest-level abstraction concerning constract storage primitive.
+//! The highest-level abstraction concerning contract storage primitive.
 //!
 //! They provide the most guarantees and should be preferred over the other
 //! primitive types if possible.