fix some typos in docs (#10598)

docs/add-code-flow.md

@@ -1,6 +1,6 @@
 # IPFS : The `Add` command demystified
 
-The goal of this document is to capture the code flow for adding a file (see the `coreapi` package) using the IPFS CLI, in the process exploring some datastructures and packages like `ipld.Node` (aka `dagnode`), `FSNode`, `MFS`, etc.
+The goal of this document is to capture the code flow for adding a file (see the `coreapi` package) using the IPFS CLI, in the process exploring some data structures and packages like `ipld.Node` (aka `dagnode`), `FSNode`, `MFS`, etc.
 
 ## Concepts
 - [Files](https://github.com/ipfs/docs/issues/133)
@@ -99,4 +99,4 @@ Within the function, a new `Adder` is created with the configured `Blockstore` a
 
   - **[`adder.PinRoot()`](https://github.com/ipfs/go-ipfs/blob/v0.4.18/core/coreunix/add.go#L171)** - *Pin all files under the `MFS` **root***
 
-    The whole process ends with `PinRoot` recursively pinning all the files under the `MFS` **root**
+    The whole process ends with `PinRoot` recursively pinning all the files under the `MFS` **root**

docs/datastores.md

@@ -53,7 +53,7 @@ Uses [pebble](https://github.com/cockroachdb/pebble) as a key value store.
 }
 ```
 
-The following options are availble for tuning pebble.
+The following options are available for tuning pebble.
 If they are not configured (or assigned their zero-valued), then default values are used.
 
 * `bytesPerSync`: int, Sync sstables periodically in order to smooth out writes to disk. (default: 512KB)