Apply Mongoose docs edits by Ev

PUBLISHED_FROM=5cd78790a03580aa23dd3d2d8b825ad449083cc2

docs/c-api/util.h/mg_avprintf.md

@@ -6,9 +6,9 @@ signature: |
   int mg_avprintf(char **buf, size_t size, const char *fmt, va_list ap);
 ---
 
-Print message to buffer. If buffer is large enough to hold the message,
-return buffer. If buffer is to small, allocate large enough buffer on heap,
-and return allocated buffer.
+Prints message to the buffer. If the buffer is large enough to hold the
+message, it returns buffer. If buffer is to small, it allocates a large
+enough buffer on heap and returns allocated buffer.
 This is a supposed use case:
 
    char buf[5], *p = buf;