[PATCH olang v1 1/2] docs: spec: rename program to translation-unit

[Carlos Maniero <carlos@maniero.me>]

We started to rename the program node in AST to translation-unit. This
commit also makes a few refactors on spec such as:

- Makes EOF a end-of-statement
- create global-statements section to accommodate upcoming global
  definitions.

Signed-off-by: Carlos Maniero <carlos@maniero.me>
---
 docs/pages/language-specification.md | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/docs/pages/language-specification.md b/docs/pages/language-specification.md
index 5769d95..4541ba8 100644
--- a/docs/pages/language-specification.md
+++ b/docs/pages/language-specification.md
@@ -22,7 +22,9 @@ language.
 
 ```
 (* Entry Point *)
-<program>             ::= <ows> <function-definition> <ows> <end-of-file>
+<translation-unit>    ::= <ows> (<global-statements> <end-of-statement>)*
+
+<global-statements>   ::= <function-definition>
 
 (* Functions *)
 <function-definition> ::= 'fn' <ws> <function-name> <ows>
@@ -35,7 +37,7 @@ language.
 (* Statements *)
 <block>               ::= '{' <ows> <statement> <ows> (<end-of-statement>
 <ows> <statement> <ows>)* <end-of-statement>? <ows> '}'
-<end-of-statement>    ::= ';' | <line-break>
+<end-of-statement>    ::= ';' | <line-break> | <end-of-file>
 <statement>           ::= <return-statement>
 <return-statement>    ::= 'return' <ws> <expression>
 
-- 
2.34.1