fixing grammar and typos

exercises/084_async.zig

@@ -1,4 +1,5 @@
-//
+// WARNING: AS OF Zig 0.13.x Async is no longer supported.
+// Until further notice skip to #092_interfaces.zig
 // Six Facts:
 //
 // 1. The memory space allocated to your program for the

exercises/106_files.zig

@@ -2,15 +2,15 @@
 // Until now, we've only been printing our output in the console,
 // which is good enough for fighting alien and hermit bookkeeping.
 //
-// However, many other task require some interaction with the file system,
+// However, many other tasks require some interaction with the file system,
 // which is the underlying structure for organizing files on your computer.
 //
 // The File System provide a hierarchical structure for storing files
 // by organizing files into directories, which hold files and other directories,
-// thus creating a tree structure for navigating.
+// thus creating a tree-like structure for navigating.
 //
-// Fortunately, zig standard library provide a simple api for interacting
+// Fortunately, the zig standard library provides a simple API for interacting
-// with the file system, see the detail documentation here
+// with the file system, to learn more, see the detailed documentation here
 //
 // https://ziglang.org/documentation/master/std/#std.fs
 //
@@ -29,7 +29,7 @@ pub fn main() !void {
     // then we'll try to make a new directory /output/
     // to put our output files.
     cwd.makeDir("output") catch |e| switch (e) {
-        // there are chance you might want to run this
+        // there is a chance you might want to run this
         // program more than once and the path might already
         // been created, so we'll have to handle this error
         // by doing nothing

exercises/107_files2.zig

@@ -5,7 +5,7 @@
 //      with content `It's zigling time!`(18 byte total)
 //
 // Now there no point in writing to a file if we don't read from it am I right?
-// let's wrote a program to read the content of the file that we just created.
+// let's write a program to read the contents of the file we just created.
 //
 // I am assuming you've created the appropriate files for this to work.
 //
@@ -37,10 +37,10 @@ pub fn main() !void {
     // this should print out : `AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA`
     std.debug.print("{s}\n", .{content});
 
-    // okay, seem like threat of violence is not the answer in this case
+    // okay, seems like threats of violence are not the answer in this case
     // can you go here to find a way to read the content ?
     // https://ziglang.org/documentation/master/std/#std.fs.File
-    // hint: you might find two answer that are both vaild in this case
+    // hint: you might find two answers that are both vaild in this case
     const byte_read = zig_read_the_file_or_i_will_fight_you(&content);
 
     // Woah, too screamy, I know you're excited for zigling time but tone it down a bit