Fix some grammar, add a footnote...

Maybe I should expand that section more and maybe add a section in ch5
about how to use fp and/or pass arguments on the stack if necessary that
I can refer to as "we'll cover making local variables on the stack in
ch5".

It just...seems unecessary and beyond the scope of the book since it's
almost never used.

Author: rswinkle

book.adoc

@@ -2,7 +2,7 @@
 
 = MIPS Assembly Programmming
 Robert Winkler <[email protected]>
-v1.0.2, 2023-10-24
+v1.0.3, 2023-12-13
 :toc:
 
 include::info.adoc[]

ch1.adoc

@@ -1,3 +1,6 @@
+:what_matters: footnote:[Obviously compilers have to follow stricter rules, but for the
+purposes of learning and actually using assembly directly, there's no reason to make your life
+harder than necessary.]
 
 == Chapter 1: Data
 
@@ -57,11 +60,11 @@ int main()
 }
 ----
 
-The first thing you have to remember is that when converting from a higher level
-language to assembly (any assembly) is that what matters is whether it's functionally
-the same, not that everything is done in exactly the same way.  In this instance,
-that means realizing that your literal strings and your local variables `name`
-and `age` become globals in MIPS.
+The first thing you have to remember when converting from a higher level language
+to assembly (any assembly), is that what matters is whether it is functionally
+the same, not whether everything is done in exactly the same way{what_matters}.
+In this instance, that means realizing that your literal strings and your local
+variables `name` and `age` become globals in MIPS.
 
 [source,mips,linenums]
 ----

ch5.adoc

@@ -166,7 +166,7 @@ The `$sp` register is technically preserved but not in the same way.  Basically
 what you allocate (subtract) you have to deallocate (add) before returning
 from a function, thus preserving the original value.
 
-You can ignore `$at, $k0-$k1, $gp` and most of the time `$fp` too.  In over 5 years
+You can ignore `$at, $k0-$k1, $gp` and most of the time `$fp` too.  In over 7 years
 of tutoring I've helped students with MIPS from at least 2 dozen different colleges
 and I think I've only seen a professor force his students to use `$fp`
 or pass more than 4 arguments twice.  You can see{fp_is_s8} register 30 sometimes