Docs generated from: feat: add fputc wrapper to IO (#1417)

* feat: add fputc wrapper to IO

fputc is a low-level function that writes a single C character to a
file. We can use this as a basis for more elegant APIs.

The signature matches that of the C standard library function for
compatibility, which takes an Int instead of a char. However, the
documentation notes that the int argument is converted to an unsigned
char.

* doc: fix typos for fgetc and fputc docs

core/IO.Raw.html

@@ -510,7 +510,7 @@ <h3 id="fgetc">
 
  </span>
  <p class="doc">
- <p>gets a character from file (thin wrapper for the from C standard library).</p>
+ <p>gets a character from file (thin wrapper for fgetc from the C standard library).</p>
 
  </p>
  </div>
@@ -534,6 +534,26 @@ <h3 id="fopen">
 
  </p>
  </div>
+ <div class="binder">
+ <a class="anchor" href="#fputc">
+ <h3 id="fputc">
+ fputc
+ </h3>
+ </a>
+ <div class="description">
+ external
+ </div>
+ <p class="sig">
+ (Fn [Int, (Ptr FILE)] Int)
+ </p>
+ <span>
+
+ </span>
+ <p class="doc">
+ <p>writes a character to a file (thin wrapper for fputc from the C standard library).</p>
+
+ </p>
+ </div>
  <div class="binder">
  <a class="anchor" href="#fread">
  <h3 id="fread">