[mlir][doc] Fix typos in mlir/docs/LangRef.md

[zzz00yx]

Summary

It fixes some typos in the language reference.

[mehdi_amini]

Thanks! I'll land this for you, I assume you don't have commit access.

[mehdi_amini]

I need your author informations though: "name <email>" to use for the git commit.

[zzz00yx]

In D150046#4324492, @mehdi_amini wrote:

I need your author informations though: "name <email>" to use for the git commit.

Thanks, I indeed do not have commit access.
My information: Yan Xin <[e-mail]>

mlir/docs/LangRef.md

 These operations only work when targeting LLVM as a backend (e.g. for CPUs and
 GPUs), and are required to align with the LLVM definition of these intrinsics.
 
 ## Operations
 
 Syntax:
 
 ```
-operation            ::= op-result-list? (generic-operation | custom-operation)
+operation             ::= op-result-list? (generic-operation | custom-operation)
                           trailing-location?
-generic-operation    ::= string-literal `(` value-use-list? `)`  successor-list?
+generic-operation     ::= string-literal `(` value-use-list? `)`  successor-list?
                           dictionary-properties? region-list? dictionary-attribute?
                           `:` function-type
-custom-operation     ::= bare-id custom-operation-format
-op-result-list       ::= op-result (`,` op-result)* `=`
-op-result            ::= value-id (`:` integer-literal)
-successor-list       ::= `[` successor (`,` successor)* `]`
-successor            ::= caret-id (`:` block-arg-list)?
-dictionary-propertes ::= `<` dictionary-attribute `>`
-region-list          ::= `(` region (`,` region)* `)`
-dictionary-attribute ::= `{` (attribute-entry (`,` attribute-entry)*)? `}`
-trailing-location    ::= (`loc` `(` location `)`)?
+custom-operation      ::= bare-id custom-operation-format
+op-result-list        ::= op-result (`,` op-result)* `=`
+op-result             ::= value-id (`:` integer-literal)
+successor-list        ::= `[` successor (`,` successor)* `]`
+successor             ::= caret-id (`:` block-arg-list)?
+dictionary-properties ::= `<` dictionary-attribute `>`
+region-list           ::= `(` region (`,` region)* `)`
+dictionary-attribute  ::= `{` (attribute-entry (`,` attribute-entry)*)? `}`
+trailing-location     ::= (`loc` `(` location `)`)?
 ```
 
 MLIR introduces a uniform concept called *operations* to enable describing many
 different levels of abstractions and computations. Operations in MLIR are fully
 extensible (there is no fixed list of operations) and have application-specific
 semantics. For example, MLIR supports
 [target-independent operations](Dialects/MemRef.md),
 [affine operations](Dialects/Affine.md), and