copyedit: booting chapter

Booting/linux-bootstrap-6.md

@@ -46,7 +46,7 @@ This function takes five parameters:
   * `input`;
   * `input_size`;
   * `output`;
-  * `output_isze`;
+  * `output_size`;
   * `virt_addr`.
 
 Let's try to understand what these parameters are. The first parameter, `input` is just the `input_data` parameter of the `extract_kernel` function from the [arch/x86/boot/compressed/misc.c](https://github.com/torvalds/linux/blob/v4.16/arch/x86/boot/compressed/misc.c) source code file, cast to `unsigned long`:
@@ -146,7 +146,7 @@ Now, we call another function:
 initialize_identity_maps();
 ```
 
-The `initialize_identity_maps` function is defined in the [arch/x86/boot/compressed/kaslr_64.c](https://github.com/torvalds/linux/blob/master/arch/x86/boot/compressed/kaslr_64.c) source code file. This function starts by initialising an instance of the `x86_mapping_info` structure called `mapping_info`:
+The `initialize_identity_maps` function is defined in the [arch/x86/boot/compressed/kaslr_64.c](https://github.com/torvalds/linux/blob/master/arch/x86/boot/compressed/kaslr_64.c) source code file. This function starts by initializing an instance of the `x86_mapping_info` structure called `mapping_info`:
 
 ```C
 mapping_info.alloc_pgt_page = alloc_pgt_page;
@@ -254,7 +254,7 @@ add_identity_map(mem_avoid[MEM_AVOID_ZO_RANGE].start,
 		 mem_avoid[MEM_AVOID_ZO_RANGE].size);
 ```
 
-THe `mem_avoid_init` function first tries to avoid memory regions currently used to decompress the kernel. We fill an entry from the `mem_avoid` array with the start address and the size of the relevant region and call the `add_identity_map` function, which  builds the identity mapped pages for this region. The `add_identity_map` function is defined in the [arch/x86/boot/compressed/kaslr_64.c](https://github.com/torvalds/linux/blob/v4.16/arch/x86/boot/compressed/kaslr_64.c) source code file and looks like this:
+The `mem_avoid_init` function first tries to avoid memory regions currently used to decompress the kernel. We fill an entry from the `mem_avoid` array with the start address and the size of the relevant region and call the `add_identity_map` function, which  builds the identity mapped pages for this region. The `add_identity_map` function is defined in the [arch/x86/boot/compressed/kaslr_64.c](https://github.com/torvalds/linux/blob/v4.16/arch/x86/boot/compressed/kaslr_64.c) source code file and looks like this:
 
 ```C
 void add_identity_map(unsigned long start, unsigned long size)